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': 'The most probable diagnosis in the below specimen in a 20 year old female with mass abdomen, on removal of ovary shown below \nSelect and explain. \nA. Choriocarcinoma, B. Dysgerminoma, C. Embryonal cell tumor, D. Malignant teratoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dysgerminoma:\n\nIt is the most common pure germ cell tumor of ovary.\nIts solid, firm and non-cystic (solid tumor of young – first differential is dysgerminoma)\nIt corresponds to Seminoma.\nIt is common under the age of 20.\nIt is usually unilateral.\nIt is neutral.\nIt secrets placental alkaline phosphatase.\nIt may be associated is hypoplasia or aplasia of part of genital tract.\nIt is very radiosensitive.\nIt is potentially malignant with malignancy rate of 30-50%.\n\nEndodermal sinus/yolk sac tumor is 2nd most common germ cell tumor.', 'role': 'assistant'}]