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.

When his obsession with Katie and her boyfriends reaches extreme limits, Janet suggests that Doug needs psychiatric help and he seeks out an expert who gives him advice that goes wrong whenever it is applied. Throughout the latter half of the film, Katie has three boyfriends, two of whom she eventually stops dating. At the end of the film, Katie takes a class trip to Europe and reunites with Richard again -- at which point Bonnie, _her_ younger tomboy sister, begins her own dating spree. <sep>, Pronoun: her <sep>, A: Katie <sep>, B: Bonnie
Output:
A