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': 'In case of renal transplant, most common infection within one month is - \nSelect and explain. \nA. Pneumococcus, B. Gram-ve organism, C. Pneumocystis carinii, D. Cryptococcus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]