**Core Concept**
The Woods lamp emits ultraviolet (UV) light with a specific wavelength to diagnose various skin conditions, including fungal and bacterial infections, and to detect porphyrias. This UV light is used in dermatology to visualize skin lesions and abnormalities.

**Why the Correct Answer is Right**
The correct answer, 360 nM, corresponds to the UVB region of the electromagnetic spectrum, which is the range of UV light emitted by the Woods lamp. This specific wavelength is chosen because it is absorbed by the porphyrins present in the skin, causing them to fluoresce and making them visible under the lamp. This phenomenon is the basis for the use of the Woods lamp in diagnosing porphyrias and other skin conditions.

**Why Each Wrong Option is Incorrect**
* **Option B:** 460 nM is in the blue visible light range, not UV light, and is not used in the Woods lamp.
* **Option C:** 660 nM is in the red visible light range and is closer to the peak wavelength of light emitted by the sun, but it is not used in the Woods lamp.
* **Option D:** 760 nM is in the near-infrared range and is not used in the Woods lamp.

**Clinical Pearl / High-Yield Fact**
The Woods lamp is a useful tool in dermatology for diagnosing skin conditions, but it should be used with caution, as prolonged exposure to UV light can cause skin damage and increase the risk of skin cancer.

**✓ Correct Answer: A. 360 nM**