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 patient has subclinical folate deficiency. Which of the following drug cannot precipitate megaloblastic anemia in this patient? \nSelect and explain. \nA. Alcohol, B. Metformin, C. Proguanil, D. Chloroquine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Megaloblastic anaemia can be caused by a deficiency of folic acid or vitamin B12. The drugs that can result in a deficiency of folic acid include:\nB – B12 and folic acid deficiency\nA – Alcohol\nT – Trimethoprim\nS – Sulfasalazine\nM – Metformin\nA – Antifolates (Methotrexate, pyrimethamine, proguanil)\nN – N2O', 'role': 'assistant'}]