Detailed Instructions: 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.
Problem:Du Xi (fl. 190s--231), courtesy name Zixu, was an adviser to the warlord Cao Cao in the late Eastern Han dynasty. _He_was a subordinate of Cao Cao's general Xiahou Yuan. <sep>, Pronoun: He <sep>, A: Du Xi <sep>, B: Cao Cao
Solution:
A