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: Medicine
[{'content': 'A patient has Hb 6 gm% folic acid 82g/ml, vitamin B12 60 pg/ml, serum iron 180g/dl, and MCV-104.The diagnosis is - \nSelect and explain. \nA. Iron deficiency anaemia, B. Vitamin B12 deficiency, C. Folic acid deficiency, D. Pyridoxine deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]