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.
Q: He returned to St. Louis in 1837. That year, his half-brother Tom Tobin, then 14 years old, left with Charles and his colleague Ceran St. Vrain to return to Taos. Tom worked as a trapper and scout at Bent's Fort and in Taos. Along with _his_ brother, Tobin worked at Simeon Turley's store, mill, and distillery at Arroyo Hondo. <sep>, Pronoun: his <sep>, A: Tom <sep>, B: Tobin
A:
B