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.
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-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,
.
Example solution: 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.
Example explanation: The passage describes the 704th's actions during Operation Market Garden.

Problem: Question: Which of the materials that the palace facades featured was naturally formed? Passage:Birks, a company that designs, manufactures and retails jewellery, timepieces, silverware and gifts, acquired the building in September 1912. The building was significantly reworked in 1912 to accommodate the jewellery store. The rework added distinctive Renaissance Revival palace facades designed by Percy Nobbs, featuring terracotta, granite, bronze and Tyndall stone. Above the third-floor openings are six terracotta medallions depicting the sources of the materials used by jewellers, with a seventh medallion on the north facade. These medallions depict turquoise (representing semi-precious stones), an elephant (representing ivory), a Kimberley Negro] searching for diamonds, a man diving for pearls, an oceanic wave delivering the riches of the sea (mother-of-pearl, coral and a tortoise shell), a precious metal-smelting gnome, and a silversmith surrounded by the tools of his trade. Above the medallions is a frieze depicting such characters and places as King Solomon, the Queen of Sheba, gates of Jerusalem, Hiram, king of Tyre, Negroes and an Indian, and the three wise men giving and receiving gifts. $150,000 of alterations to the ground-floor show-window area in 1951 included a granite base and Tyndall stone facings surrounding the solid bronze show windows, as well as corner columns and vestibule walls lined with Travertine marble. The building was the Winnipeg showpiece for Birks for nearly eighty years. By 1991, the basement, first, second and third floors had all been substantially altered by the Birks Company, leaving only the fourth floor of dormitories unaltered from the YMCA era. Birks continued in this building until the 1987 when it moved to Portage Place.


Solution: The rework added distinctive Renaissance Revival palace facades designed by Percy Nobbs, featuring terracotta, granite, bronze and Tyndall stone