In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Example Input: Question: When was the high school that Rogers graduated from founded? Passage:Rogers was born in Somerville, Massachusetts, in 1921. He graduated from Newton North High School in Newtonville in 1939. He enlisted as a private in April 1942, became an aviation cadet in August 1942, and completed pilot training and received a commission as a second lieutenant at Yuma, Arizona in 1943. During World War II, Rogers served as a P-39 Airacobra pilot with the 353rd Fighter Squadron at Hamilton Field, California He moved with the squadron to the European Theater of Operations, flew P-51 Mustang aircraft and became squadron commander. He is a fighter ace, credited with 12 enemy aircraft while flying from bases in England, Italy and France. He returned to the United States in January 1945 and was assigned to flying duties in fighter aircraft until November 1945 when he became commandant of troops at Hunter Field, Georgia. Between September 1946 and June 1947, he served as flight commander, operations officer, and commander of the 77th Fighter Squadron, 20th Fighter Group, at Shaw Air Force Base, South Carolina. He next was a student at the University of Virginia under the Air Force Institute of Technology program from July 1947 to August 1949. In August 1949 Rogers was transferred to Headquarters United States Air Force as an intelligence staff officer in the Directorate of Intelligence. He attended the language course at Lacaze Academy in Washington D.C., from October 1952 to June 1953, in preparation for attaché duties. He received a bachelor of science degree in military science from the University of Maryland in 1952. Rogers served as assistant air attach in Madrid, Spain from June 1953 to February 1957. He then returned to Headquarters United States Air Force as chief of the Current Intelligence Branch in the Office of the Deputy Chief of Staff, Operations. In 1958 he was transferred to the Organization of the Joint Chiefs of Staff as director of current intelligence, J-2, and in August 1960 entered the National War College. In July 1961 he was assigned to the Office of the Assistant Secretary of Defense with duty station at the State Department.
 Links: a. Air Force Institute of Technology b. 353rd Combat Training Squadron c. Newton North High School d. European Theater of Operations, United States Army
Example Output: c

Example Input: Question: Who was older, Tian Chengsi or Li Baochen? Passage:By 775, one of the military governors who had only nominally been submissive to Emperor Daizong, Tian Chengsi the military governor of Weibo Circuit (魏博, headquartered in modern Handan, Hebei), had particularly offended not only the imperial government but also his fellow warlords—by seizing much of Zhaoyi Circuit (昭義, headquartered in modern Anyang, Henan) after the death of its military governor Xue Song in 773; by looking down on Li Zhengji the military governor of Pinglu Circuit (平盧, headquartered in modern Tai'an, Shandong) and Li Baochen the military governor of Chengde (成德, headquartered in modern Shijiazhuang, Hebei); and by killing Li Baochen's brother Li Baozheng (李寶正), who was also his son-in-law, after his own son Tian Wei (田維) died after colliding with Li Baozhen while playing polo. Li Baochen and Li Zhengji thus offered to attack Tian, and Emperor Daizong decided to take this opportunity to destroy the rebellious Tian. As Zhu Tao was then submissive to the imperial government, he joined forces with Li Baochen and another general loyal to the imperial government, Xue Jianxun (薛兼訓), to attack Weibo from the north, while Li Zhengji and Li Zhongchen attacked from the south. The joint forces had initial successes, but when Zhu and Li Baochen attacked Cang Prefecture (滄州, in modern Cangzhou, Hebei), which was defended by Tian's cousin Tian Tingjie (田庭玠), they could not capture it quickly. Meanwhile, Tian Chengsi had persuaded Li Zhengji to withdraw with flattery. In addition, Li Baochen was offended when an imperial eunuch, Ma Chengqian (馬承倩), who had visited Li Baochen's army, was so dissatisfied with Li Baochen's gift to him that he threw it on the ground, and Tian was also able to use hoaxes to persuade Li Baochen that if he joined forces with Tian to attack Lulong, he would be successful. Li Baochen thus turned against Zhu, launching a surprise attack on him, but was unable to kill Zhu, effectively ending any hopes of the campaign against Tian and subsequently creating an enmity between the Chengde and Lulong Circuits. Emperor Daizong was subsequently forced to reaccept Tian Chengsi's nominal submission.
 Links: a. Tai'an b. Polo c. Shandong d. Li Baochen
Example Output: d

Example Input: Question: Are the chemicals released at the same time? Passage:The sympathoadrenal system is a physiological connection between the sympathetic nervous system and the adrenal medulla and is crucial in an organism's physiological response to outside stimuli. When the body receives sensory information, the sympathetic nervous system sends a signal to preganglionic nerve fibers, which activate the adrenal medulla through acetylcholine. Once activated, norepinephrine and epinephrine are released directly into the blood by postganglionic nerve fibers where they act as the bodily mechanism for "fight-or-flight" responses. Because of this, the sympathoadrenal system plays a large role in maintaining glucose levels, sodium levels, blood pressure, and various other metabolic pathways that couple with bodily responses to the environment. During numerous diseased states, such as hypoglycemia or even stress, the body's metabolic processes are skewed. The sympathoadrenal system works to return the body to homeostasis through the activation or inactivation of the adrenal gland. However, more severe disorders of the sympathoadrenal system such as phaeochromocytoma (a tumor on the adrenal medulla) can affect the body's ability to maintain a homeostatic state. In such cases, curative agents such as adrenergic agonists and antagonists are used to modify epinephrine and norepinephrine levels released by the adrenal medulla.
 Links: a. Postganglionic nerve fibers b. Hypoglycemia c. Postganglionic nerve fibers d. Postganglionic nerve fibers
Example Output:
a