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: Built by Polish engineer Thaddeus Kosciuszko under the command of George Washington, Fort Mercer was built in 1777 Link Information: Andrzej Tadeusz Bonawentura Kościuszko (; 4 or 12 February 1746  Answer: 31
How old was the engineer who built Fort Mercer when it was built?

Context: Their score for the movie included an instrumental selection titled "Cotton's Dream", which was later rescored to become the theme song of the soap opera The Young and the Restless; Link Information: First broadcast on March 26, 1973, The Young and the Restless was originally broadcast as half-hour episodes Answer: March 26, 1973
When did the soap opera that used the song "Cotton's Dream" as it's theme first air?

Context: His father having been killed in 1942 while on active duty during World War II Link Information:  A state of total war emerged, directly involving more than 100 million people from more than 30 countries. Answer:  more than 30

How many nations fought in the war that killed Bathurst's father in 1942?