C. OCD
A. Agoraphobia is incorrect because this is an anxiety disorder associated with the fear of leaving ones home
B. MDD is a depressive disorder that decreases motivation and serotonin/dopamine, not associated with washing hands
D. Psychosis is the description of a psychotic episode where one may feel watched or detached from the world, such as viewing themselves from an outside perspective
The subject of a scientific experiment is the person or organism that becomes the target of the experiment.
The answer is B, pneumonia and the flu
It sounds like a cardiac sonographer , because they specialize in echocardiography which is a sonogram (ultra sound) of the heart and blood vessels