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: Surgery
[{'content': 'Stage- II testicular teratoma is treated by- \nSelect and explain. \nA. Orchidectomy + RPLND, B. Orchidectomy + Chemotherapy, C. Orchidectomy, D. Radiotherapy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • Most common testicular tumor in prepubertal adults: Teratoma\n• Tumor is composed of two or more embryonic germ cell layers\xa0that may be both mature and immature.\n• Tumor is very heterogeneous with both solid and cystic\xa0components.\nTeratoma is divided into three subsets\n1. Mature: well-differentiated ectodermal, mesodermal, or endodermal tissues\n2. Immature: incompletely differentiated tissues\n3. Teratoma with areas of malignant transformation: sarcoma, squamous carcinoma, adenocarcinoma\n• Teratomas are potentially malignant\nClinical Features\n• Age range: first, second, and third decades.\n• Mature and immature forms have metastatic potential in adults but in children are uniformly benign.\n• The primary tumor generally presents as an enlarged testis with both solid and cystic components.\n• The teratoma component of metastatic GCT is resistant to chemotherapy and radiotherapy.\nTumor Markers\n• AFP is raised in 20-25%', 'role': 'assistant'}]