This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
[{'content': 'Most common tumour of pineal region is? \nSelect and explain. \nA. Germinoma, B. Pineocytoma, C. Pineoblastoma, D. Secondaries', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common tumour of pineal region is germinoma. Most common tumour of pineal parenchymal gland is pineocytoma.', 'role': 'assistant'}]