This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
"Black dot" ring worm is caused by 
Select and explain. 
A. Microsporum, B. Epidermophyton, C. Candida, D. Trichophyton
D: Trichophyton
Answer: D: Trichophyton 
Explanation: In endothrix, a Trichophyton infection, the hair shaft breaks off at the skin surface, leaving the hairs visible as black dots in the scalp.