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: a mutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring, Fact2: Sometimes animal offspring look very different from their parents., Question: A mutation in what of a parent can cause children to look very different from their parents? (A) chromosomes (B) sex cells (C) fur and fat (D) coded genes (E) hormones (F) sperm (G) epidermal (H) Enzymes
Output:
B