This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Surgery
Cock's peculiar tumor is: 
Select and explain. 
A. Basal cell carcinoma, B. Squamous cell carcinoma, C. Infected sebaceous cyst, D. Cylindroma
C: Infected sebaceous cyst
Answer: C: Infected sebaceous cyst 
Explanation: * Cock's peculiar tumor - Infected sebaceous cyst of scalp * Potts puffy tumor - Osteomyelitis of skull bone - Involved pa - frontal bone * Pilomatrixoma - AKA calcifying epithelium of malherb - Benign hair follicle derived tumor * Cylindroma - AKA turban tumor as it appears like turban histologically