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': 'Characteristic finding in CT in a TB case is - \nSelect and explain. \nA. Exudate seen in basal cistern, B. Hydrocephalus is noncommunicating, C. Calcification commonly seen in umbellium, D. Ventriculitis is a common finding', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]