Q: You are presented with the quiz "What controls anti-aging?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "hormones are chemical messengers that control many body functions" and "growth hormone is in many ways an anti-aging hormone". So, what's the best answer to the question?

OPT:
(1). A computer.
(2). air.
(3). chemical messengers.
(4). ice.
(5). an electric stove.
(6). Electrical energy.
(7). water.
(8). Chemical energy.
A:
(3).