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, Hari has been diagnosed to have schizophrenia. Which of the following acts as a limiting factor in the use of clozapine as an antipsychotic drug in this patient ? \nSelect and explain. \nA. Its potential to cause agranulocytosis, B. Its inability to benefit negative symptoms of schizophrenia, C. High incidence of extrapyramidal side effects, D. Production of hyperprolactinemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]