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.

Q: 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

A: How many years did Duke of Tang serve as emperor after renaming Daxing, Chang'an?
****
Q: Context: He consequently served two terms as Minister of Tourism, between 2001 and 2002, and again between 2003 and 2004 Link Information: none Answer: none

A: Who is currently serving in the office that Elon occupied between 2001 and 2004?
****
Q: Context: In a 2006 essay Link Information:  He retired completely from politics at the 1992 general election. Answer: 1992

A:
When did the author of the 2006 essay retire from politics?
****