In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.
One example: Question: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin? 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,
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Solution is here: 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.
Explanation: The passage describes the 704th's actions during Operation Market Garden.

Now, solve this: Question: What modern country is Calcutta part of? Passage:His plea was approved by the Shella Presbytery on 15 February. He left Shella on 18 February (Wednesday) and spent the following Sunday at Sylhet. He met Benjamin Aitken, an elder of Free Church of Scotland and sub-editor of Calcutta-based newspaper The Englishman, who volunteered to join him in his expedition. His frequent companion Kasinath, a young Assamese Christian who was preaching that afternoon, and one Khasi Christian U Khanai also joined him. On Monday 23 February the four set sail on a boat on Surma River, preaching to people along their journey. They spent Sunday 1 March at Silchar and moved the next day. On the third day they arrived at Jhalnacherra and spent a night at Alexandrapur tea garden where Mary Winchester was kidnapped by Mizo Warriors in 1871, the origin of British encounter with Mizos. On Thursday they continued their journey and after a week on Tlawng River, they reach Guturmukh (Kutbul Kai in Mizo), a British telegraph station at the Tut River junction, on 11 March. Here they stayed for four days and saw the first thatched huts of Mizos at a distant hill top, including stockades used during the British military expedition. On Sunday 15 March afternoon they met roaming native Mizos for the first time in their boat ride. They were friendly boys between 10 and 15 years old from neighbouring village, Liankunga chiefdom. They exchanged salt and tobacco for the boys' yams and bananas. They gave them some boxes of matches, and Bible pictures. They also sang several songs to them which they "listened with their mouths open." On Monday afternoon they arrived at Changsil, where they camped among the military escort commanded by Captain Williamson. With the army they moved on Thursday to Sairang where they spent the night. Army horses arrived in the next morning and they headed for Aizawl ("Fort Aijal" as it was called). They reached Aizawl at noon on 20 March. They stayed there for four weeks, learning about Mizo lifestyle, distributing Bible pictures and preaching among non-Mizo such as Khasi, Manipuri, and Naga workers stationed there. Full of hope to return and start formal education and evangelism, they left Aizawl on 17 April. He published his appeal to open mission field in Lushai Hills in June and July 1891 issue of Y Goleuad. Welsh General Assembly at Machynlleth in June 1892 decided to adopt Lushai Hills as an extension of the Khasi Hills mission field. By then Williams had died of typhoid on 21 April 1892 at Mawphlang, some 25km from Shillong city.

Solution:
He met Benjamin Aitken, an elder of Free Church of Scotland and sub-editor of Calcutta-based newspaper The Englishman, who volunteered to join him in his expedition