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': 'A drug that is effective for rheumatoid arthritis but is not appropriate for osteoarthritis is : \nSelect and explain. \nA. Acetaminophen, B. Infliximab, C. Ketorolac, D. Rofecoxib', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]