Each day, while sid is sitting at his desk at work, he continually thinks about germs. each time this occurs, he washes his hands. sid probably suffers
a) agoraphobia
b) panic disorder
c) generalized anxiety disorder
d) obsessive-compulsive disorder

The answer is d) obsessive-compulsive disorder.

Explanation:

When someone suffers from this disorder, he/she will probably have unwanted thoughts or ideas that will drive them to do something repeatedly --in Sid's case, he washes his hands every time he thinks of germs.

After the person has done the action (called compulsions), he/she will only experience a short-term relief. The toughts will come back. Not carrying out the behaviours might result in deep anxiety and stress.

you answered your own : -/