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: staying warm has a positive impact on an animal 's survival, Fact2: Animals that survive develop an immunity, but are also carriers for life., Question: what has a positive impact on an animal 's ability to be a carrier for life? (A) four limbs (B) staying frosty (C) staying isolated (D) prolactin release (E) staying warm (F) staying mad (G) coded genes (H) organic molecules
Output:
E