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: How long is the body of water that Whittier Narrows is part of? Passage:During the expedition, Father Crespi observed a location along the river that would be good for a settlement or mission. However, in 1771, Father Serra instead commissioned two missionaries to establish the Mission San Gabriel Arcangel-San Gabriel Mission near the present day Whittier Narrows section of the San Gabriel River. The missionaries encountered resistance from the Tongva to their attempts to resettle the Natives on the mission. The mission encountered further trouble in 1776 when a flood damaged the mission, convincing the missionaries to move and rebuild the mission on a higher and more defensible location: its present site in San Gabriel. The first Spanish governor of Las Californias, Felipe de Neve had, as well, recommended to Viceroy Bucareli Father Crespi's location on the Rio Porciuncula (Los Angeles River) for a mission. Instead, in 1781, King Charles III mandated that a pueblo be built on the site instead, which would be the second town in Alta California, after San Jose de Guadalupe in 1777. The monarch, disregarding the production and trade roles of the missions, saw a greater need for secular pueblos to be established as the centers of agriculture and commerce to supply the crown's ever-growing military presence in "Nueva California." The priests at the missions ignored the royal mandate and continued their ranching, trading and production of tallow, soap, hides, and beef, often in competition with new pueblo ventures.
Links: a. Los Angeles River b. History of San Jose, California c. Los Angeles River d. Whittier Narrows
Example Output: d

Example Input: Question: How long did the war that Potter fought in as an officer in the Royal Field Artillery last? Passage:Potter was born in Bedford to Reverend Brignal Peel, a Wesleyan minister, and Elizabeth Stimson. He was educated at Bedford Modern School and for a time at Worcester College, Oxford. He first performed in E. M. Royle's The White Man at the Lyric Theatre in London before touring. In 1915 he was George Robey's understudy at the Alhambra. During the Great War Potter served as a 2nd lieutenant in the Royal Field Artillery in France. He served in the 6th Division 2nd Brigade 21st Battery, from 8 February 1917 before returning to music hall once the war was over. Potter cultivated an individual style and persona, wearing a straw boater, wide grey flannel trousers (he said he invented the Oxford bags style at the Coliseum in 1920), an 'Old Borstolian' blazer and carrying a notebook with a rolled umbrella. James Agate described him as "that sham Harrovian who bears upon his blazer the broad arrows of a blameful life".
Links: a. Harrow School b. World War I c. Lyric Theatre, London d. World War I
Example Output: b

Example Input: Question: Of the cities where the two hospitals where Ruhakana worked are located, what is the population of the largest? Passage:Rugunda was born in Kabale District on 7 November 1947. As a young boy, he would often sit and read the newspapers to his father Surumani Rugunda, and it is these experiences at an early age that sparked his later interest in politics. Rugunda attended Kigezi High School and Busoga College Mwiri where he served as head prefect, before joining the Makerere University Medical School and later the University of Zambia where he studied medicine, graduating a Bachelor of Medicine and Bachelor of Surgery. He later studied at the University of California, Berkeley and obtained a Master of Science in public health. Before joining Ugandan politics, Rugunda worked as medical officer in Zambia, as a physician at the District of Columbia General Hospital in Washington, D. C., and at Kenyatta National Hospital in Nairobi, Kenya.
Links: a. Washington, D.C. b. Washington, D.C. c. Washington, D.C. d. Zambia
Example Output:
a