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.

Input: Consider Input: Context: Liu Bei combined forces with Cao Cao and defeated Lü Bu at the Link Information: The Battle of Xiapi was fought between the forces of Lü Bu against the allied armies of Cao Cao and Liu Bei from the winter of 198 to 7 February 199 Answer: from the winter of 198 to 7 February 199

Output: How long did the fight last in which Liu Bei and Cao Cao defeated Lü Bu?


Input: Consider Input: Context: Born in Berlin Link Information: Berlin (, ) is the capital and largest city of Germany by both area and population. Its 3,748,148 (2018)  Answer: 3748148 

Output: How many people live in the city where Herz was born?


Input: Consider Input: Context: Ngawang Drakpa Gyaltsen was the son of Drowai Gonpo Link Information: Drowai Gonpo (aGro bai mgon po) (1508–1548) was a king who wielded power in parts of Central Tibet from 1524 to 1548.  Answer: Tibet


Output: Where was Gyaltsen's father born?