I believe the answer is: the hospital
Conditioned stimulus refers to a stimulus that already become a trigger to a certain response due to the process of classical conditioning. From the example above, alexis start to cry after she saw a hospital. Because of this, we can say that the sight of hospital act as the trigger the elicit the response.
"Nice Poem, Now Eat the Potatoes."
- Irish Farmer
The answer is: External Noise
