Friday Pop Quiz #374

The correct answer is C. M. canis. 

Microsporum canis and Trichophyton tonsurans both cause tinea capitis. M. canis is more commonly associated with inflammatory tinea capitis and kerion formation.

The other organisms are not as strongly associated with inflammatory tinea capitis.

References:

Gupta AK, Summerbell RC. Tinea capitis. Med Mycol. 2000;38(4):255-287. doi:10.1080/mmy.38.4.255.287