Which tinea specifically affects the head and scalp?

Tinea capitis is the correct answer because it specifically refers to a fungal infection that affects the scalp and hair follicles. This condition is caused by dermatophytes, which are fungi that thrive on keratin found in hair and skin. Symptoms of tinea capitis may include hair loss, itching, and the presence of scaly patches on the scalp.

In contrast, the other conditions listed are associated with different areas of the body. Tinea corporis affects the body, typically presenting as ring-shaped lesions on non-hairy skin. Tinea pedis, commonly known as athlete's foot, primarily affects the feet and often causes itching and peeling skin between the toes. Tinea cruris, or jock itch, occurs in the groin area and is characterized by a red, itchy rash.

Understanding the specific area of infection helps in diagnosing and treating these dermatophyte infections appropriately.