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.
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Question: Context: the last Bulgarian Tsar Ivan Shishman Link Information: 

Ivan Shishman () ruled as emperor (tsar) of Bulgaria in Tarnovo from 1371 to 3 June 1395. Answer: 24

Answer: How long did the last Bulgarian Tsar rule the Empire?


Question: Context: It was recorded at South Point Studios, Miami. Link Information: It was recorded at South Point Studios, Miami Answer: Miami

Answer: What U.S. state was "Dirty Dancer" recorded in?


Question: Context: The United States of America will compete at the 2015 World Championships in Athletics from August 22 to August 30 in Beijing, China. Link Information: China (), officially the People's Republic of China (PRC), is a country in East Asia and the world's most populous country, with a population of around /1e9 round 3 billion in 2017. Covering approximately 9600000 km2, i Answer: 9600000 km2

Answer:
What is the size of the country that hosted the 2015 World Championships in Athletics?