You will be given a definition of a task first, then some input of the task.
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.

He distinguished levels of logical reasoning, and introduced the notion of metalogic. Vasiliev spent 1912-13 in Western Europe (mostly Germany) and published his salient works ''Logic and Metalogic'' and ''Imaginary (non-Aristotelian) logic''. Vasiliev constructed non-Aristotelian logic using the concepts, and even the manner of reasoning, common to Aristotelian logic. _He_was aware of the achievement in mathematical logic (and even carefully studied Ernst Schr*der 's works) but did not make an attempt to formalise ''imaginary'' logic. <sep>, Pronoun: He <sep>, A: Vasiliev <sep>, B: Ernst Schr*der
Output:
A