Task: Question Answering
Input (English): 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?  
 (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.
Output (English): C