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: Gynaecology & Obstetrics
[{'content': 'A 20 year female presents with a ovarian mass 6x 6 x 6cm in size. Ultrasonography reveals solid structures in the mass. Her serum biomarkers such as AFP. fO-hCG and CA 125 are normal, however, her serum alkaline phosphatase was found to be elevated. The most likely diagnosis is \nSelect and explain. \nA. Dysgerminoma, B. Endodermal sinus tumor, C. Malignant teratoma, D. Mucinous cystadenocarcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]