Q: Some touch receptors sense a difference in pain or what?\nOptions:\n- (A) heat\n- (B) cold\n- (C) skin\n- (D) nerves\n- (E) color\n- (F) contact\n- (G) smell\n- (H) motion
Let's think step by step below.

User
Some touch receptors sense differences in temperature or pain. Heat and temperature are the same. Some touch receptors sense differences in heat or pain.
Thus, the answer is (A).
Assistant