Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
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-Lo 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
Solution: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin?
Reason: The passage describes the 704th's actions during Operation Market Garden, and the answer specifies when the operation happened.

Now, solve this instance: Passage: Drupada, son of King Prishata, and Drona study together under the tutelage of Rishi Bhardwaja, Drona's father. They become great friends and Drupada assures Drona that once he becomes king, he will share half of his kingdom with Drona. While Drupada becomes a king after the death of his father, Drona lives a life of poverty. Drona approaches Drupada for help; Drupada, now conscious of the difference of status between them, refuses to acknowledge Drona's friendship and shuns Drona, calling him a beggar. Drona is later employed by Bhishma to train the Kuru princes. After the military education of the Kauravas and the Pandavas ends, as his gurudakshina, Drona asks the princes to defeat and capture Drupada. Firstly, all the Kauravas, along with Karna, attack Drupada, but Drupada defeats all of them. Then the Pandavas led by Arjuna defeat Drupada, binding him in ropes and bringing him to Drona. Drona sets Drupada free, but retains half of the kingdom that had been promised to him. Humiliated, Drupada seeks vengeance but he realizes that he cannot match Drona's might. So, Drupada performed the Putrakameshti yajna to beget a son who could slay Drona. From the fire of the yajna, twins Dhrishtadyumna and Draupadi are born. Years later, Draupadi married Arjuna and later in the Mahabharata war, Dhrishtadyumna beheaded Drona.
Link Information: none Answer: none
Student:
How many other children did Drona's father have other than her?