Part 1. Definition
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.
Part 2. Example
Context: During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen. Link Information: Operation Market Garden was a failed World War II military operation fought in the Netherlands from 17 to 25 September 1944. Answer: from 17 to 25 September 1944
Answer: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin?
Explanation: The context describes the 704th's actions during Operation Market Garden, and the answer specifies when the operation happened.
Part 3. Exercise
Context: He received his Ph.D. from Princeton University in 1940 Link Information: Fritz Haber (; 9 December 1868 – 29 January 1934) was a German chemist Answer: chemist 
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
What profession did Fritz Haber work in the year Barschall received his Ph.D?