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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Drug of choice for controlling severe pain in cancer patients is:
assistant
The correct answer is  Morphine is a potent analgesic and relieves pain without loss of consciousness. Dull aching visceral pain is relieved better than sharp aching pain. Ref KD Tripathi 8th ed.