Q: In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
The epidermis is part of (A) is the largest organ and also the body's first defense against germs (B) is used the second largest organ and used for breathing by humans (C) soaks in toxins in the air (D) repels sunlight and UV rays
A:
A