This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plastic & Reconstructive Surgery, Subject name: Surgery
Cock's peculiar tumor is - 
Select and explain. 
A. Rodent ulcer of nose, B. Local osteomyelitis of cranium, C. Chronic infection of sebaceous cyst, D. Keratin horn
C: Chronic infection of sebaceous cyst
Answer: C: Chronic infection of sebaceous cyst 
Explanation: Ans. is 'c' i.e., Chronic infection of sebaceous cyst o 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.