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: Forensic Medicine
[{'content': "What is sexual masochism \nSelect and explain. \nA. Sexual gratification is obtained by suffering pain, B. Sexual gratification is obtained by infliction of pain, C. Sexual gratification by exposing one's genitalia, D. Sexual gratification by rubbing private parts", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Masochism: Sexual gratification is obtained by suffering pain.\nSadism: Sexual gratification is obtained by infliction of pain.', 'role': 'assistant'}]