Identify the causative organism responsible for ringworms.

The correct answer is Option (4) → Trichophyton

Ringworm is one of the most common infectious diseases in man. It is caused by fungi of the genera Microsporum, Trichophyton and Epidermophyton. It shows dry, scaly lesions on the skin, nails and scalp, with intense itching. Heat and moisture help the fungi grow, so it is common in skin folds such as the groin.

(1) Staphylococci — Incorrect. These are bacteria. Alexander Fleming was working on Staphylococci when he discovered penicillin.

(2) Glomus — Incorrect. Glomus is a useful fungus that forms mycorrhiza with plant roots.

(3) Trichoderma — Incorrect. Trichoderma is a free-living fungus used as a biocontrol agent against plant pathogens.

(4) Trichophyton — Correct. It is one of the fungi that cause ringworm.