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: Ma Xiu (died 211) was the son of the warlord Ma Teng during the late Han Dynasty period of Chinese history. When his older brother Ma Chao rebelled against Cao Cao, Ma Xiu and _his_ father were executed. <sep>, Pronoun: his <sep>, A: Cao Cao <sep>, B: Ma Xiu

B