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': "Cock's peculiar tumour is - \nSelect and explain. \nA. An infected sebaceous cyst, B. A malignant tumour of the scalp, C. A metastatic lesion of the scalp, D. An indicator of underlying osteomyelitis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. 'a' An infected sebaceous cyst Cocks peculiar tumour is actually a complication of sebaceous cyst. When the sebaceous cyst of the scalp ulcerates excessive granulation tissue forms resembling fungating epithelioma.This is called cock's peculiar tumour. Also know these terms Cylindroma? - A malignant epithelial tumour also k/a Turban tumor - Known as cylindroma because of histological appearance Pilomatrixoma (Calcifying epithelioma of Malherbe) ? - It is a benign hair follicle derived tumour. Pott's puffy tumour ? It is osteomyelitis of the skull associated with subperiosteal swelling and edema.", 'role': 'assistant'}]