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': 'The lymph nodes first involved in cancer of the skin of the scrotum are - \nSelect and explain. \nA. Superfical inguinal, B. External iliac, C. Para aortic, D. Gland of Cloquet', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • Squamous cell carcinoma of scrotumQ, most commonly resulted from exposure to environmental carcinogens including chimney soot, tars, paraffin and petroleum products.\n• Superficial inguinal lymph nodes are the first lymph nodes involved.\xa0\nRisk Factors\n• Most cases results from poor hygiene and chronic inflammation.\nDiagnosis\n• Diagnosis is established by biopsy of scrotal skin.\nTreatment\n• Wide excision with 2 cm margins\xa0should be performed for malignant tumors.\n• Prognosis correlates with presence or absence of nodal involvement.', 'role': 'assistant'}]