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
Hair perforation test is positive in infection with 
Select and explain. 
A. Trichophyton, B. Microsporum, C. Epidermophyton, D. All of the above
A: Trichophyton
Answer: A: Trichophyton 
Explanation: Hair preparation test is done to differentiate Trichophyton rubrum and Trichophyton mentagrophytes. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition