This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycology, Subject name: Microbiology
Favus is caused by: 
Select and explain. 
A. Blockage of sebaceous duct, B. Staph aureus, C. Trichophyton schoenleinii, D. Trichophyton concentricum
C: Trichophyton schoenleinii
Answer: C: Trichophyton schoenleinii 
Explanation: Favus is a form of tinea capitis in which there is formation of crusting lesions (scutula) in the involved region of the infection. It is most often caused by T. schoenleinii.