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.
Input: During his tenure, Askenasy completed additional neurosurgical training as a fellow in the U.S.A. and Canada at Lahey Clinic with Gilbert Horrax (Boston, MA), Mayo Clinic with Alfred Adson (Rochester, MN), University of Illinois at Chicago with Paul Bucy (Chicago, IL), University of Chicago with Percival Bailey (Chicago, IL), McGill University with Wilder Penfield (Montreal, Quebec, Canada), University of Michigan with Max M. Peet (Ann Arbor, MI), and the University of Pennsylvania with Charles Frazier (Philadelphia, PA). During _his_ training with Walter Dandy, Dr. Askenasy learned trigeminal nerve vascular decompression of the cranial nerve entry zone. <sep>, Pronoun: his <sep>, A: Charles Frazier <sep>, B: Walter Dandy

Neither