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 30 year old female epileptic on phenytoin, developed weakness and fatigue. Blood examination revealed Hb = 4.6 gm. MCV = 102 fl and MCH = 40 pg/dl. What is the most probable diagnosis ? \nSelect and explain. \nA. Hea failure, B. Iron deficiency anaemia, C. Phenytoin induced agranulocytosis, D. Megalobalstic anaemia', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Megalablostic anaemia Raised MCV (normal 86-98) and MCH (normal 28-33) with low hemoglobin (normal 12-16) suggest the diagnosis of megaloblastic anemia. Remember Amongst antiepileptics, phenytoin, phenobarbitone and primidone can cause megaloblastic anemia.", 'role': 'assistant'}]