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: Amphibians have permeable skin that easily absorbs substances from the environment., Fact2: Natural Toxins Toxins are poisonous substances from bacterias, plants or animals., Question: Why can amphibians easily absorb toxins? (A) salamanders (B) permeable skin (C) hydrate their cells (D) it needs them (E) poisonous frogs (F) Pesticides (G) cold blooded (H) bending light rays
Output:
B