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

Fact1: plasma is formed by electrons separating from atoms in stars, Fact2: Most of the matter in stars is in a plasma state., Question: where do electrons separate? (A) fields (B) stars (C) mitosis (D) cells (E) nucleus (F) tube (G) iron (H) shells
Output:
B