Possible answers: (1). cells. (2). gills. (3). HIV. (4). skin. (5). immune. (6). rabies. (7). lungs. (8). Herpes.
Q: You are presented with the quiz "What organ in the body can protect you from toxins?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "skin is used for protecting the body from harmful substances" and "natural toxins can be harmful too". So, what's the best answer to the question?
A:
(4).