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: Radiology
[{'content': 'Maximum radiopaque shadow in ovary is seen in \nSelect and explain. \nA. Teratoma, B. Dysgerminoma, C. Mucinous cyst adenoma, D. Granulose cell tumour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Teratoma is most radio-opaque because of its calcifications (Ref: Radiology Review Manual by Wolfgang Dahne 6thEtd, 1010)', 'role': 'assistant'}]