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
Methotrexate is used for the management of all of these conditions except 
Select and explain. 
A. Rheumatoid arthritis, B. Psoriasis, C. Sickle cell anemia, D. Organ transplantation
C: Sickle cell anemia
Answer: C: Sickle cell anemia 
Explanation: Methotrexate is used for the management of: