Definition: In this task, you will be presented with a text, a pronoun from the text, and two candidate names. You should determine what the pronoun refers to and classify the answers into A, B, or Neither. A and B here are referring to option A and option B. Position of the pronoun in the text is showed within two "_"s.

Positive Example 1 -
Input: He grew up in Evanston, Illinois the second oldest of five children including his brothers, Fred and Gordon and sisters, Marge (Peppy) and Marilyn. His high school days were spent at New Trier High School in Winnetka, Illinois. MacKenzie studied with Bernard Leach from 1949 to 1952. _His_ simple, wheel-thrown functional pottery is heavily influenced by the oriental aesthetic of Shoji Hamada and Kanjiro Kawai. <sep>, Pronoun: His <sep>, A: MacKenzie <sep>, B: Bernard Leach
Output: A

Positive Example 2 -
Input: Reb Chaim Yaakov's wife is the sister of Rabbi Moishe Sternbuch, as is the wife of Rabbi Meshulam Dovid Soloveitchik, making the two Rabbis his uncles. Reb Asher's brother Rabbi Shlomo Arieli is the author of a critical edition of the novallae of Rabbi Akiva Eiger. Before _his_ marriage, Rabbi Arieli studied in the Ponevezh Yeshiva headed by Rabbi Shmuel Rozovsky, and he later studied under his father-in-law in the Mirrer Yeshiva. <sep>, Pronoun: his <sep>, A: Reb Asher <sep>, B: Akiva Eiger
Output: Neither

Negative Example 1 -
Input: He had been reelected to Congress, but resigned in 1990 to accept a post as Ambassador to Brazil. De la Sota again ran for governor of C*rdoba in 1991. Defeated by Governor Angeloz by over 15%, this latter setback was significant because it cost De la Sota much of _his_ support within the Justicialist Party (which was flush with victory in the 1991 mid-terms), leading to President Carlos Menem 's endorsement of a separate party list in C*rdoba for the 1993 mid-term elections, and to De la Sota's failure to regain a seat in Congress. <sep>, Pronoun: his <sep>, A: Angeloz <sep>, B: De la Sota
Output: Neither

Negative Example 2 -
Input: On 19 March 2007, during a campaign appearance for the New South Wales State Election, the then opposition leader Peter Debnam was confronted by Reucassel wearing nothing but Speedos and a baseball cap, making fun of Debnam's campaign appearances in the swimwear. When TV cameras remained focused on Reucassel rather than Mr Debnam, _he_said, ``Sorry, I'm not Peter Debnam, he's over there. <sep>, Pronoun: he <sep>, A: Reucassel <sep>, B: Debnam
Output: B

Now complete the following example -
Input: Bernard Osgood Koopman (1900 -- August 18, 1981) was a French-born American mathematician, known for his work in ergodic theory, the foundations of probability, statistical theory and operations research. After living in France and Italy, the Koopmans immigrated to the United States in 1915. Koopman was a student of George David Birkhoff and _his_ initial work concentrated on dynamical system s and mathematical physics. <sep>, Pronoun: his <sep>, A: Koopman <sep>, B: George David Birkhoff
Output: 


Answer: A