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: The club was formed in 1892 following a disagreement between the board of Everton and club president John Houlding, who owned the club's ground, Anfield. The dispute over rent resulted in Everton leaving Anfield for Goodison Park, which left Houlding with an empty stadium. Link Information: Everton played at the Anfield ground from 1884 until 1892. Answer: Anfield
answer:
Which ground did the Liverpool Football Club play at longer, Anfield or Goodison Park?


question:
Context: In 1961, the CIA arranged a trip to the U.S. for further leukemia treatment Link Information: none Answer: none
answer:
Who was in charge of the CIA the year Fanon went back to the US for cancer treatment?


question:
Context: Daxing was renamed Chang'an in year 618 when the Duke of Tang, Li Yuan, proclaimed himself the Emperor Gaozu of Tang. Link Information: born Li Yuan, courtesy name Shude, was the founder of the Tang dynasty of China, and the first emperor of this dynasty from 618 to 626. Answer: 8
answer:

How many years did Duke of Tang serve as emperor after renaming Daxing, Chang'an?