Information:  - Kenya, officially the Republic of Kenya, is a country in Africa and a founding member of the East African Community (EAC). Its capital and largest city is Nairobi. Kenya's territory lies on the equator and overlies the East African Rift covering a diverse and expansive terrain that extends roughly from Lake Victoria to Lake Turkana (formerly called Lake Rudolf) and further south-east to the Indian Ocean. It is bordered by Tanzania to the south and southwest, Uganda to the west, South Sudan to the north-west, Ethiopia to the north and Somalia to the north-east. Kenya covers , and had a population of approximately 45 million people in July 2014.  - Tsavo lions are a distinct variety of Masai lions ( Panthera leo nubica ) living around the Tsavo River in the Tsavo East National Park in Kenya . Tsavo males are notable for their lack of mane and smooth pelt , their size , and that they actively participate in hunting . Two of Tsavo males have been known as man - eaters , who involving an incident during the building of the Uganda Railway in the late 19th century .  - Nairobi is the capital and largest city of Kenya. It is famous for having the Nairobi National Park, the world's only game reserve found within a major city. The city and its surrounding area also form Nairobi County, whose current governor is Evans Kidero and Deputy Governor is Jonathan Mueke.  - The lion ("Panthera leo") is one of the big cats in the genus "Panthera" and a member of the family Felidae. The commonly used term African lion collectively denotes the several subspecies in Africa. With some males exceeding in weight, it is the second-largest living cat after the tiger. Wild lions currently exist in sub-Saharan Africa and in India (where an endangered remnant population resides in Gir Forest National Park). In ancient historic times, their range was in most of Africa, including North Africa, and across Eurasia from Greece and southeastern Europe to India. In the late Pleistocene, about 10,000 years ago, the lion was the most widespread large land mammal after humans: "Panthera leo spelaea" lived in northern and western Europe and "Panthera leo atrox" lived in the Americas from the Yukon to Peru. The lion is classified as a vulnerable species by the International Union for Conservation of Nature (IUCN), having seen a major population decline in its African range of 3050% over two decades during the second half of the twentieth century. Lion populations are untenable outside designated reserves and national parks. Although the cause of the decline is not fully understood, habitat loss and conflicts with humans are the greatest causes of concern. Within Africa, the West African lion population is particularly endangered.    After reading the paragraphs above, we are interested in knowing the entity with which 'tsavo lion' exhibits the relationship of 'taxon rank'. Find the answer from the choices below.  Choices: - family  - form  - genus  - subspecies
subspecies