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: Unknown
[{'content': 'Most common ovarian malignancy in a young lady is - \nSelect and explain. \nA. Dysgerminoma, B. Ovarian Mucinous Cystadenocarcinoma, C. Ovarian Serous Cystadenocarcinoma, D. Fibroid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans - a', 'role': 'assistant'}]