This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs & Other Biological Methods of Treatment, Subject name: Psychiatry
The clinical effects of the antidepressant drugs is mainly based on - 
Select and explain. 
A. Change in neurotransmitter receptor sensitivity, B. Decreased level of neurotransmitters, C. Change in efficacy of neurotransmitters, D. None of the above
A: Change in neurotransmitter receptor sensitivity
Answer: A: Change in neurotransmitter receptor sensitivity 
Explanation: Ans. is 'a' i.e., Change in neurotransmitter receptor sensitivity