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: Pharmacology
[{'content': 'For pain control in a patient having history of GI bleeding, which of the following is given ? \nSelect and explain. \nA. Nimesulide, B. Ibuprofen, C. Rofecoxib, D. Pentazocin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]