With optical density of 2, percentage of light transmitted is:

**Core Concept**
In radiology and medical imaging, optical density (OD) is a measure of the absorption of light by a material, such as a radiographic film. The percentage of light transmitted through the material is inversely related to its optical density.

**Why the Correct Answer is Right**
The correct answer is based on the Beer-Lambert law, which describes the relationship between the absorption of light and the concentration of the absorbing material. For a given optical density, the percentage of light transmitted is calculated as 10^(-OD). In this case, with an optical density of 2, the percentage of light transmitted is 10^(-2) = 1%.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately represent the relationship between optical density and light transmission.
* **Option B:** This option is incorrect because it does not account for the inverse relationship between optical density and light transmission.
* **Option C:** This option is incorrect because it does not accurately calculate the percentage of light transmitted for a given optical density.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the Beer-Lambert law applies to both radiography and other medical imaging modalities, such as CT scans and MRI. Understanding the relationship between optical density and light transmission is crucial for interpreting medical images.

**Correct Answer:** D. 1%