In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.

Example Input: Question: Did the trade affect the Aleut people negatively? Passage:The maritime fur trade brought the Pacific Northwest coast into a vast, new international trade network, centered on the north Pacific Ocean, global in scope, and based on capitalism, but not, for the most part, on colonialism. A triangular trade network emerged linking the Pacific Northwest coast, China, the Hawaiian Islands (only recently discovered by the Western world), Britain, and the United States (especially New England). The trade had a major effect on the indigenous people of the Pacific Northwest coast, especially the Aleut, Sugpiaq, Tlingit, Haida, Nuu-chah-nulth, and Chinook peoples. A rapid increase of wealth occurred among the Northwest Coast natives, along with increased warfare, potlatching, slaving, and depopulation due to epidemic disease. However, the indigenous culture was not overwhelmed by rapid change, but actually flourished. For instance, the importance of totems and traditional nobility crests increased, and the Chinook Jargon, which remains a distinctive aspect of Pacific Northwest culture, was developed during this era. Native Hawaiian society was similarly affected by the sudden influx of Western wealth and technology, as well as epidemic diseases. The trade's effect on China and Europe was minimal, but for New England, the maritime fur trade and the significant profits it made helped revitalize the region, contributing to its transformation from an agrarian to an industrial society. The wealth generated by the maritime fur trade was invested in industrial development, especially textile manufacturing.

Example Output: b

Example Input: Question: Which city is the largest - the city near junction K, or the city near junction A? Passage:Belgrade marshalling yard () or Makis railway station (), or Makis freight station, is a classification yard of the Belgrade railway junction and the largest railway station in Serbia. It is located in the neighbourhood of Makis in Cukarica of Belgrade. The railroad continues to Ostruznica in one line via park A, in the other direction to Ostruznica via park B, in third direction to Resnik via junction B near Zeleznik and junction K of Belgrade railway junction near Petlovo Brdo, in fourth direction to Resnik via junction R in the tunnel below Vidikovac and junction A near Knezevac, in the fifth direction to Rakovica via park B and junction R, in the sixth direction to Rakovica via park A and junction T, in the seventh direction to Rakovica via park B and junction T per second line and the eight towards direction to Jajinci. Belgrade marshalling yard consists of 120 railway tracks.

Example Output: a

Example Input: Question: Was flosequinan ever approved? Passage:He was principal investigator on the REFLECT trial for flosequinan which ran from 1987-1989 and the following PROFILE trial from 1991-1994. He was PI on a study of amlodipine that ran from 1987-1989 and the following PRAISE trial from 1992-1995 and PRAISE 2 from 1996-1999; the PROMISE trial for milrinone 1988-1990; the ATLAS trial for lisinopril from 1993-1997; the PRECISE trial for carvedilol from 1993-1995 and the following COPERNICUS trial from 1997-2002; the ENABLE trial (1999-2001) and REACH-1 trial (1997-2003) for bosentan; the OVERTURE trial (1999-2002) for omapatrilat; REVIVE I and II (2001-2006) for levosimendan; and the TRUE-AHF trial of ularitide that started in 2013. He also chaired the steering committee for the RADIANCE trial from 1989-1992 which studied the use of digoxin in people who were also treated with ACE inhibitors and chaired the steering committee for the RENEWAL trial (1999-2002) for etanercept. He was also the co-PI of the PARADIGM-HF trial that led to the approval of valsartan/sacubitril.

Example Output:
b