Given the task definition, example input & output, solve the new input case.
In this task, you will be presented with a text and a pronoun. You should write the name that the pronoun refers to. Position of the pronoun in the text is showed within two "_"s.
Example: 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
Output: MacKenzie
Based on the text, his refers to MacKenzie.

New input case for you: Michael R. Frey is a politician from Virginia, who has been a Republican member of the Fairfax County Board of Supervisors since 1991; representing the Sully district in the western part of the county. The Sully district includes the unincorporated town of Chantilly and part of Dulles Airport. Prior to _his_ 1991 election as supervisor from the newly created district, Frey worked as an aide to first Chairman of the Board of Supervisors John F. Herrity and later Springfield district Supervisor Elaine N. McConnell. <sep>, Pronoun: his
Output:
Frey