## Core Concept
The Wood's lamp, also known as the black light, emits ultraviolet (UV) light. It is used in dermatology to help diagnose certain skin conditions. The specific wavelength of light produced by a Wood's lamp is crucial for its diagnostic applications.

## Why the Correct Answer is Right
The correct answer, 360 nm, falls within the UVA range of the ultraviolet spectrum. UVA light has a longer wavelength compared to UVB light and is less likely to cause burning. The 360 nm wavelength is specifically chosen because it helps in diagnosing fungal and bacterial infections, as well as conditions like vitiligo, by causing certain conditions to fluoresce.

## Why Each Wrong Option is Incorrect
- **Option A:** 310 nm is more on the shorter side and closer to the UVB range, which is not the optimal range for a Wood's lamp.
- **Option B:** 380 nm is slightly longer than the optimal range and not specifically associated with the typical use of a Wood's lamp.
- **Option D:** 760 nm is in the near-infrared range, far beyond the UV range necessary for a Wood's lamp.

## Clinical Pearl / High-Yield Fact
A key clinical use of the Wood's lamp is to diagnose **ringworm (tinea)** infections, which fluoresce under UV light due to the presence of certain fungal metabolites. This makes the 360 nm wavelength particularly useful in dermatological diagnostics.

## Correct Answer: C. 360 nm.