Which of the following is not the causal organism for ringworm?
a. Microsporum
b. Trichophyton
c. Epidermophyton
d. Macrosporum
The answer is the option (d) Macrosporum
Microsporum, Trichophyton, and Epidermophyton are all types of fungi that can cause ringworm infections. However, Macrosporum is not a recognized cause of ringworm.