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.

Input: Consider Input: Question: Which president saw the establishment of the recreation area that contains the lower of the San Juan River? Passage:From there it flows west through the Navajo Nation, turning northwest near Shiprock and its namesake monolith, crossing very briefly back into southwest Colorado (within half a mile (0.8km) of the Four Corners quadripoint) before entering southeastern Utah. West of Bluff, Utah the river slices through the Comb Ridge and enters a series of rugged winding canyons, often over in depth. The lower of the San Juan River, in a remote portion of the Glen Canyon National Recreation Area, are flooded by Lake Powell, which is formed by Glen Canyon Dam on the Colorado River. The San Juan joins the Colorado in San Juan County, Utah at a point about to the north of Navajo Mountain and northeast of Page, Arizona.

Output: a

Input: Consider Input: Question: How old was Purdee when the film that won four Emmy's came out? Passage:Fioretti, who wanted to sound less Italian, started to use the name Feury, and began to be artistic in many ways. Although Dyslexic, he authored several screenplays, began painting for the first time in 1966, and began producing tightly budgeted B-Movies in the early 1970s. Since the 1980s, he was the home producer of the feature film productions of his wife Lee Grant. With the 1986 published and by Grant staged documentation on homelessness in the US under President Ronald Reagan, Down and Out in America, for which Feury and with his co-producer Milton Justice received an Academy Award for Best Documentary Feature the following year. Going on to produce a number of documentary films as well as TV Movies based on the documentaries. The socially engaged documentary film project: his production Baghdad ER took a look at the activities of US military surgeons in the Iraq war zone. Baghdad ER, produced in conjunction with DCTV, HBO, and his longtime collaborators Roberta Morris Purdee and wife Lee Grant. The film went on to win four Emmys, a Peabody, and the Dupont-Columbia.

Output: a

Input: Consider Input: Question: How many areas of study did Boston University offer degrees in the year Mairson began working there as a Visiting Professor? Passage:Mairson received a B.A. in Mathematics from Yale University in 1978 and a Ph.D. in Computer Science from Stanford University in 1984 under the supervision of Jeffrey Ullman. His Ph.D. thesis, The Program Complexity of Searching a Table, won the Machtey Award at the 1983 IEEE Symposium on Foundations of Computer Science (FOCS). Mairson was a Postdoctoral researcher at INRIA Rocqencourt from 1984 to 1985, at Stanford University in 1985, and at the University of Oxford in 1986. He held a Visiting Professor position from 1999 to 2001 at Boston University. From 2005 to 2007, Mairson has served as the Chair of the Faculty Senate at Brandeis. He is currently an Associate Editor of the journal Logical Methods in Computer Science and Information and Computation, and sits on the editorial board of Higher-Order and Symbolic Computation.
Output: a