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.

Context: Duffy later appointed New York regional administrator of the Securities and Exchange Commission office (1969–1972). His tenure as Regional Administrator of the United States Securities and Exchange Commission was in a time of turmoil in Wall Street. Link Information: none Answer: none
What turmoil was Wall Street facing during Duffy's tenure as Regional Administrator of the United States Securities and Exchange Commission?

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
How long did the last Bulgarian Tsar rule the Empire?

Context: In August 2017, both Jemma Lucy and Jordan Davies took part in the twentieth series of Celebrity Big Brother. Link Information: On Day 1, fifteen celebrity housemates entered the house. Answer: 15

How many total people participated in the Celebrity Big Brother series that Lucy and Davies particpated in?