This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'A patient is having a malignancy and has been suffering from severe pain. Which of the following opioid analgesics can be used as transdermal patch for alletion of pain in him? \nSelect and explain. \nA. Morphine, B. Pentazocine, C. Fentanyl, D. Tramadol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (Ref: KDT 6/e p459) Fentanyl can be used as a transdermal patch for prolonged treatment of cancer associated pain.', 'role': 'assistant'}]