human
Question: When a dog smells food and begins drooling, it is responding to an external stimulus. Which of these describes a response to an internal stimulus?

Choices:
A) A cat sees a mouse and crouches.
B) A parrot hears a name and repeats it.
C) A person eats spoiled food and vomits.
D) A worm senses water and moves to the surface.
gpt
The correct answer is 2: A person eats spoiled food and vomits..