Q:Information:  - Juqu Mujian (before 420  447), named Juqu Maoqian () in some sources, formally Prince Ai of Hexi (), was a king of the Xiongnu state Northern Liangwith most Chinese historians considering him the last king, although with some considering his brothers Juqu Wuhui and Juqu Anzhou to be kings of the state as well. By the time that Juqu Mujian succeeded his father Juqu Mengxun (Prince Wuxuan) in 433, Northern Liang appeared to be stronger than ever, yet was under the shadow of the much stronger state Northern Wei, to which Northern Liang was nominally a vassal. In 439, Emperor Taiwu of Northern Wei launched a major campaign against Northern Liang and captured both his capital Guzang (, in modern Wuwei, Gansu) and Juqu Mujian himself. Juqu Mujian remained an honored Northern Wei subject as Emperor Taiwu's brother-in-law until 447, when Emperor Taiwu, believing him to be trying to rebel, forced him to commit suicide.  - Juqu Wuhui (died 444) is viewed by some historians as a prince of the Xiongnu state Northern Liang, as after the state's territory was largely seized by Northern Wei in 439, and his older brother Juqu Mujian (Prince Ai) was captured by Northern Wei, Juqu Wuhui tried to hold out against Northern Wei, initially on Northern Liang's old territory, and later, after that attempt failed, at Gaochang. He continued to use the title of Prince of Hexi, a title used by his brother and previously by his father Juqu Mengxun (Prince Wuxuan). Chinese historians dispute over whether Juqu Wuhui and his successor and brother Juqu Anzhou should be considered Northern Liang rulers or not, and most consider Juqu Mujian the final prince of Northern Liang.  - Emperor Taiwu of Northern Wei (()) (408452), personal name Tuoba Tao (), nickname Bili (), was an emperor of Northern Wei. He was generally regarded as a capable ruler, and during his reign, Northern Wei roughly doubled in size and united all of northern China, thus ending the Sixteen Kingdoms period and, together with the southern dynasty Liu Song, started the Southern and Northern Dynasties period of Chinese history. He was a devout Taoist, under the influence of his prime minister Cui Hao, and in 444, at Cui Hao's suggestion and believing that Buddhists had supported the rebellion of Gai Wu (), he ordered the abolition of Buddhism, at the penalty of death. This was the first of the Three Disasters of Wu for Chinese Buddhism. Late in his reign, his reign began to be cruel, and his people were also worn out by his incessant wars against Liu Song. In 452, he was assassinated by his eunuch Zong Ai, who put his son Tuoba Yu on the throne but then assassinated Tuoba Yu as well. The other officials overthrew Zong and put Emperor Taiwu's grandson Tuoba Jun (son of Tuoba Huang the Crown Prince, who predeceased him) on the throne as Emperor Wencheng.  - Juqu Anzhou (died 460) is viewed by some historians as a ruler of the Xiongnu states Northern Liang, as after the state's territory was largely seized by Northern Wei in 439, and his older brother Juqu Mujian (Prince Ai) was captured by Northern Wei, Juqu Anzhou's brother Juqu Wuhui tried to hold out against Northern Wei, initially on Northern Liang's old territory, and later, after that attempt failed, at Gaochang. Juqu Anzhou succeeded Juqu Wuhui after Juqu Wuhui's death in 444, and he continued to use the title of Prince of Hexi, a title used by his brothers and previously by his father Juqu Mengxun (Prince Wuxuan). Chinese historians dispute over whether Juqu Wuhui and Juqu Anzhou should be considered Northern Liang rulers or not, and most consider Juqu Mujian the final prince of Northern Liang.  - Princess Tuoba (  , personal name unknown ) , also known by her Dynasty of Northern Wei ( 386 to 534/535 ) title Princess Wuwei (  ) , was the daughter of Emperor Mingyuan of Northern Wei and who later was a princess of the Chinese / Xiongnu state Northern Liang . Her husband was Juqu Mujian ( Prince Ai ) . It is not known when she was created Princess Wuwei , either by her father or by her brother Emperor Taiwu , but in a move to ensure Juqu Mujian 's loyalty , Emperor Taiwu married her to Juqu Mujian in 437 , forcing Juqu Mujian to divorce his prior wife , Princess Li Jingshou . However , Juqu Mujian also carried on an affair with his brother 's wife , Lady Li , and Lady Li and Juqu Mujian 's sisters carried out a plot to poison Princess Tuoba . Emperor Taiwu , hearing that his sister had been poisoned , sent a number of doctors to the Northern Liang capital Guzang (  , in modern Wuwei , Gansu ) , and they were able to save her . Emperor Taiwu demanded that Lady Li be turned over , but Juqu Mujian refused and sent Lady Li away instead . In 439 , Emperor Taiwu conquered Northern Liang , and took Juqu Mujian as a captive to the Northern Wei capital Pingcheng (  , in modern Datong , Shanxi ) , but because of Princess Wuwei 's sake , continued to honor Juqu Mujian as a brother - in - law with the title Prince of Hexi . During the marriage , Princess Wuwei bore Juqu Mujian a daughter , but no sons . In 447 , Emperor Taiwu suspected Juqu Mujian of planning a rebellion and forced him to commit suicide , but buried him with honors . Princess Wuwei survived her husband , and later after her death was buried with her husband . ( Some historical records indicate that she married Li Gai (  ) the Duke of Nan Commandery , but these are not conclusive . ) Her daughter inherited her title as Princess Wuwei .    After reading the paragraphs above, we are interested in knowing the entity with which 'princess tuoba' exhibits the relationship of 'brother'. Find the answer from the choices below.  Choices: - emperor taiwu of northern wei  - juqu anzhou  - juqu mujian  - juqu wuhui  - tuoba yu
A:
emperor taiwu of northern wei