Instructions: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Input: Fact1: sound can be used for communication by animals, Fact2: Orangutans have a vocal repertoire of about 13 sounds., Question: Orangutans can communicate by doing what? (A) mental telepathy (B) Infomercials (C) contracting (D) singing opera (E) focusing a lens (F) vocalizing (G) adding heat (H) unidirectional
Output:
F