instruction:
In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
question:
Context: Warrington spent most of his career on the Texas frontier and served under Colonel Ranald S. Mackenzie during the Texas-Indian Wars of the 1870s. Link Information: On February 25, 1871, he assumed command of the 4th U.S. Cavalry at Fort Richardson in Jacksboro, Texas. Answer: the 4th U.S. Cavalry
answer:
What units did the Colonel Warrington served under inn the Texas-Indian Wars command?


question:
Context: At the top of this hill, the street passes west of Link Information: none Answer: none
answer:
How many students are enrolled at the school at the top of the hill?


question:
Context: He started teaching upon his arrival at the Central University of Venezuela in 1946 until his retirement in 1971. Link Information: He started teaching upon his arrival at the Central University of Venezuela in 1946 until his retirement in 1971. Answer: Caracas
answer:

In what city is the university located where Juan David García Bacca taught until his retirement?