Answer: A
Explanation: I personally would say the answer is A but it could very well be D. Depends if you take it in a literal or metaphorical sense.
"Derm" = skin.
So, when you are going into this field to practice skin diseases and treatment, the word you're looking for is a <u><em>dermatologist. </em></u>
A dermatologist <em>is a special doctor that manages diseases within the skin, hair, and nails. </em>
Answer:
he trains therapists to lead humor therapy sessions
