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: Was Brown's father alive when Trey signed the Bears? Passage:Theotis "Trey" Brown, III (born March 1, 1985) is a former American football cornerback who is currently the Director of Player Personnel for the St. Louis BattleHawks. Prior to being hired by the XFL, Brown served as the Executive Vice President of Football Operations for the Birmingham Iron of the Alliance of American Football. Prior to the AAF, Brown spent 9 years in the National Football League as a scout/executive. From 2010 to 2012, he was a scout with the New England Patriots. Then, from 2013 to 2018, he was with the Philadelphia Eagles in a variety of capacities including the Director of College Scouting from 2016-2018. As a player, he was signed by the Chicago Bears as an undrafted free agent in 2009. He played college football at UCLA. He also played for the New York Sentinels. He is the son of former NFL running back Theotis Brown.

Ex Output:
b

Ex Input:
Question: Where was McMahon's post-doctoral mentor from? Passage:McMahon contributed to the understanding of retinal neurophysiology alongside his post-doctoral mentor, John E. Dowling. His early research focused on ion channels that mediate transmission at electrical and glutamatergic synapses and the modulatory effects of dopamine and nitric oxide on retinal synapse networks. Through studies with zebrafish he discovered that the neurotransmitter dopamine decreases the electrical coupling within horizontal cells. Further research showed that it was the increase of cAMP within the cell resulting from dopamine binding to AMPA receptor that led to this decrease in coupling. McMahon and his colleagues also demonstrated that exogenous nitric oxide and zinc can modulate AMPA receptor mediated synaptic transmission at gap junctions in hybrid bass retinal neurons.

Ex Output:
b