This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Dose-limiting toxicity of chemotherapeutic agents is \nSelect and explain. \nA. Bone marrow toxicity, B. GI toxicity, C. Neurotoxicity, D. Respiratory problems', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Depression of bone marrow results in granulocytopenia, agranulocytosis, thrombocytopenia, aplastic anemia. This is the most serious toxicity; often limits the dose that can be employed.', 'role': 'assistant'}]