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: espite of the arrival of Nery Veloso and also of Carlos Alfaro, who would be the back–up keepers of Conde. Link Information: Nery Alexis Veloso Espinoza (born March 1, 1987) Answer:  Nery Veloso
Which of Conde's back-up keepers was older?

Context: Continuous weather observations have been maintained for the city of Boise since February 1, 1864 about 5 months after the U.S. Army established Fort Boise. Link Information: Boise's mayor, David H. Bieter, is of Basque descent Answer: David H. Bieter
Who is the current mayor of the city where the weather was continuously monitored after the U.S. Army established a fort?

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 

What profession did Fritz Haber work in the year Barschall received his Ph.D?