Q: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Passage: El Mariachi is recruited by CIA agent Sheldon Jeffrey Sands to kill General Emiliano Marquez, a corrupt Mexican Army officer who has been hired by Mexican drug lord Armando Barillo to assassinate the President of Mexico and overthrow the government. Many years before, El Mariachi and his wife Carolina confronted Marquez in a shootout and wounded the general; in retaliation, Marquez took the lives of Carolina and their daughter in an ambush. In addition to El Mariachi, Sands persuades former FBI agent Jorge Ramírez to come out of retirement and kill Barillo, who had murdered his partner Archuleta in the past. Furthermore, AFN operative Ajedrez is assigned by Sands to tail Barillo.
While monitoring Barillo's activities, Ramírez meets Billy Chambers, an American fugitive who has been living under the protection of Barillo, but can no longer stomach the horrible tasks he's been forced to carry out for him. Ramírez convinces Chambers he will provide him protection in exchange for getting closer to Barillo by tagging Chambers' pet chihuahua with a hidden microphone, and Chambers agrees to complete the deal by surrendering to U.S. authorities once Barillo has been taken down. Sands' assistant, Cucuy, originally hired to keep an eye on El Mariachi, instead tranquilizes El Mariachi and turns him over to Barillo, also offering to reveal the details of Sands's plan. Cucuy, however, is promptly killed by Chambers while El Mariachi escapes from captivity and calls his friends Lorenzo and Fideo to assist him in his mission.
A:
What is the last name of the person who hires someone to kill the corrupt Mexican army officer?