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': "All of the following statements about the methotrexate are true except \nSelect and explain. \nA. It is a cell cycle specific and kills in the S phase, B. It's toxicity primarily affects bone marrow and epithelial structure, C. Folic acid reverses it's toxic effects, D. It is a drug of choice for choriocarcinoma", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref-KDT 6/e p823 Folic acid is used to reverse the adverse effect of methotrexate. Folic acid is ineffective. All of the statements are true as discussed earlier', 'role': 'assistant'}]