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
Ectothrix is due to 
Select and explain. 
A. Trichophyton tonsurans, B. Microsporum audounii, C. Trichophyton schoenleinii, D. Trichophyton violaceum
B: Microsporum audounii
Answer: B: Microsporum audounii 
Explanation: EctothrixEndothrix*Trichophyton mentagrophytes*Microsporum canis*Microsporum gypseum*Microsporum audouinii*Trichophyton verrucosum*Trichophyton rubrum*Trichophyton schenleinii*Trichophyton tonsurans*Trichophyton violaceum*Trichophyton soudanese(Jagdish Chander- Text book of Medical Mycology 3rd edition, p127)