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': 'Methotrexate is used for the management of all of these conditions except \nSelect and explain. \nA. Rheumatoid arthritis, B. Psoriasis, C. Sickle cell anemia, D. Organ transplantation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Methotrexate is used for the management of:', 'role': 'assistant'}]