In this task, you're given a passage, 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 passage 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 passage or linked information.
One example is below.
Q: Passage: The group was occasionally diverted from strategic missions to carry out air support and interdiction missions. It supported Operation Overlord, the invasion of Normandy by attacking transportation targets, including bridges, along with airfields and strong points in France. On D Day, the squadron and the rest of the 446th Group led the first heavy bomber mission of the day. The 446th aided ground forces at Caen and Saint-Lô during July by hitting bridges, gun batteries, and enemy troops. 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. It struck lines of communications during the Battle of the Bulge. During Operation Varsity in March 1945, it supplied ground and airborne troops near Wesel. The squadron flew its last combat mission on 25 April 1945 against Salzburg, Austria. The group had flown 273 missions and had lost 58 aircraft during the war,
. 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
A: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin?
Rationale: The passage describes the 704th's actions during Operation Market Garden, and the answer specifies when the operation happened.
Q: Passage: Bill Johnson was born in Los Angeles, California, on March 30, 1960, and moved with his family to Boise, Idaho, when he was seven. He learned to ski at Bogus Basin in the late 1960s. Two years later, they moved to Brightwood, Oregon, near Mount Hood, and Johnson later attended Sandy Union High School in Sandy. He was a troubled youth who began competitive skiing on nearby Mount Hood as a means of harnessing his energy. After a run-in with the law at age 17, the juvenile defendant was given the choice between six months in jail or attending the Mission Ridge ski academy in central Washington state, and he chose the latter. His talent in the downhill event eventually landed him a spot on the U.S. Ski Team. Johnson made his World Cup debut in February 1983 and finished sixth in the downhill at St. Anton, Austria.
 Link Information: The Los Angeles metropolitan area (MSA) is the second-largest metropolitan area in the nation with a population of 13.1 million people.  Answer: 12871210
A:
What is the population difference between the two cities Johnson moved between at age seven?