Question

One of the following is not the causal organism for ringworm:

• A. Macrosporum
• B. Epidermophyton
• C. Trichophyton
• D. Microsporum

Hint:

Ringworm is caused by three important fungal genera: \[ \text{Microsporum} \] \[ \text{Trichophyton} \] \[ \text{Epidermophyton} \] A common mnemonic is: \[ \boxed{\text{MTE}} \] (Microsporum, Trichophyton, Epidermophyton)

Answer 1

The Correct Option is A

Step 1: Recall the causative organisms of ringworm. Ringworm is a fungal infection of the skin caused by dermatophytes. The common genera responsible for ringworm are: \[ \text{Microsporum} \] \[ \text{Trichophyton} \] \[ \text{Epidermophyton} \]

Step 2: Examine each option.
• Microsporum \(\rightarrow\) Causes ringworm \(\checkmark\)
• Trichophyton \(\rightarrow\) Causes ringworm \(\checkmark\)
• Epidermophyton \(\rightarrow\) Causes ringworm \(\checkmark\)
• Macrosporum \(\rightarrow\) Not a recognized causative genus of ringworm \(\times\) Therefore, \[ \boxed{\text{Macrosporum}} \] is not a causal organism of ringworm. Hence, the correct answer is: \[ \boxed{\text{(A)}} \]