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': 'Following tumour produce a marked elevation of: \nSelect and explain. \nA. Alpha feto protein, B. Placental alkaline phosphatase, C. Human placental lactogen, D. CA 125', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • Yolk sac tumors are those that resemble the yolk sac, allantois, and extraembryonic, mesenchyme.\n• They are also known as endodermal sinus tumors.\n• Yolk sac tumors can be seen in males and females, involving the testis, ovary, and other sites, such as the\nmediastinum.\n• Pure yolk sac tumor is the most common testicular neoplasm in prepubertal children.\n• Almost all the patients with a yolk sac tumor either in pare form or mixed form have a significantly elevated serum\nAlpha fetoprotein (AFP).', 'role': 'assistant'}]