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.

Q: Question: How long had Jeffrey Ullman been teaching at Stanford the year Mairson got his B.A.? 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.


A: b
****
Q: Question: How many years did the war where Lyon served with the 2nd Battalion last? Passage:Lyon was commissioned as a Second Lieutenant into the 4th (Extra Reserve) Battalion, the North Staffordshire Regiment in February 1900, but two months later, in April of the same year, transferred to the 2nd Battalion of the regiment. The 2nd Battalion was a regular battalion and was at the time on active service in South Africa during the Second Boer War, where Lyon joined the battalion and served with it throughout the war being Mentioned in Despatches in 1901. He was promoted to lieutenant on 19 January 1901, while in South Africa. After peace was declared in May 1902, Lyon left Cape Town on board the SS Bavarian and arrived in the United Kingdom the following month. He remained with the 2nd Battalion when it was posted to India in 1903 where he became adjutant and was promoted to captain.


A: b
****
Q: Question: Which of Giovanna's children died first? Passage:Giovanna married Tsar Boris III of Bulgaria in the Basilica of St Francis of Assisi, Assisi in October 1930, in a Roman Catholic ceremony, attended by Italian dictator Benito Mussolini. Bulgarians deemed her a good match, partly because her mother, Elena of Montenegro, was of Slavic ethnicity. At a second ceremony in Sofia, Giovanna (who herself was daughter of a Roman Catholic father and a formerly Orthodox mother) was married in an Eastern Orthodox Church ceremony, bringing her into conflict with the Roman Catholic Church. Giovanna adopted the Bulgarian version of her name, Ioanna. Giovanna knew the Pope's Apostolic Visitor to Bulgaria, Archbishop Angelo Roncalli, the future Pope John XXIII who was able to help her. She and Boris had two children: Marie Louise of Bulgaria, born in January 1933, and then the future Simeon II of Bulgaria in 1937.


A:
a
****