In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it, i.e., the proper nouns in the passage. Your job is to determine whether information from more than one term is needed to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.

Ex Input:
Question: Which country's air force was garrisoned at Taichung until 1955? Passage:Taichung International Airport was constructed during the era of Japanese rule and was named . The United States Air Force (USAF) had been garrisoning the base with two fighter squadrons until the Sino-American Mutual Defense Treaty came into force on March 3, 1955. The airport then expanded in 1954 according to the Sino-American Mutual Defense Treaty, and later renamed Ching Chuan Kang Air Base (CCK) in memory of General Qiu Qingquan. In 1966 the American Air Force established a joint forces air-base at CCK. It was the largest air force base in the Far East at the time, allowing Boeing B-52 Stratofortress bombers to land. During the Vietnam War, CCK became a depot for the USAF. The US Military used CCK and Shuinan Airport to run many of its long-distance Vietnam, Cambodia and Laotian bombing, scouting and cargo transport runs during the Vietnam War era. This base was shut down and most American facilities were removed after U.S. established diplomatic relations with the China in 1979.

Ex Output:
b

Ex Input:
Question: Who was the president of University of Tennessee when Mike Smithson was a student? Passage:After attending the University of Tennessee, Smithson was selected by the Red Sox in the fifth round of the 1976 Major League Baseball Draft. During the course of his seven-year minor league apprenticeship, he participated in the longest baseball game in history between the Pawtucket Red Sox and Rochester Red Wings during the 1981 season. During the early morning hours of Sunday, April 19, 1981, he worked the full 15th, 16th and 17th innings, and got two outs in the 18th inning before turning the ball over to Win Remmerswaal. Smithson allowed two hits and three bases on balls in 3 innings pitchedbut no runs. The game was suspended after 32 innings, and resumed June 23; Smithson's PawSox won it in the bottom of the 33rd frame.

Ex Output:
b

Ex Input:
Question: How old was Kahekili II's son when his father conquered O'ahu? Passage:The island has been inhabited since at least 3rd century A.D. The 304-year-old Kingdom of Oahu was once ruled by the most ancient alii in all of the Hawaiian Islands. The first great king of Oahu was Mailikukahi, the lawmaker, who was followed by many generation of monarchs. Kualii was the first of the warlike kings and so were his sons. In 1773, the throne fell upon Kahahana, the son of Elani of Ewa. In 1783, Kahekili II, King of Maui, conquered Oahu and deposed the reigning family and then made his son, Kalanikupule, king of Oahu. Kamehameha the Great would conquer in the mountain Kalanikupule's force in the Battle of Nuuanu. Kamehameha founded the Kingdom of Hawaii with the conquest of Oahu in 1795. Hawaii would not be unified until the islands of Kauai and Niihau surrendered under King Kaumualii in 1810. Kamehameha III moved his capital from Lahaina, Maui to Honolulu, Oahu in 1845. Iolani Palace, built later by other members of the royal family, is still standing, and is the only royal palace on American soil.

Ex Output:
a