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': 'Which of the following tumour shows a radiological sign called "pneumonias dilatans"? NOT RELATED-RADIOLOGY \nSelect and explain. \nA. Meningiomas, B. Ependymomas, C. Hemangioblastomas, D. Medulloblastomas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Radiological signs of meningiomas:- Dural-based tumor - Hyperostosis of skull- Pneumosinus dilatans - Dural tail sign- Strong homogenous contrast uptake - Calcification common - Mother-in-law sign', 'role': 'assistant'}]