This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
[{'content': 'Reciprocal inhibition is done by - \nSelect and explain. \nA. Systemic desensitization, B. Behaviour therapy, C. Flooding, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Systemic desensitization is based on the principle of reciprocal inhibition.', 'role': 'assistant'}]