**Core Concept**
The effective dose of a medical imaging procedure, such as a chest x-ray, is a measure of the radiation dose that an individual receives, expressed in terms of the equivalent dose in sieverts (Sv). This concept is crucial in radiology to minimize the risk of radiation-induced cancer and other health effects.

**Why the Correct Answer is Right**
The effective dose of a chest x-ray is approximately 0.1 millisieverts (mSv), which is relatively low compared to other medical imaging procedures. This is because the radiation dose from a chest x-ray is confined to a small area of the body, primarily the lungs and surrounding tissues. The effective dose takes into account the sensitivity of different tissues to radiation, including the gonads, lungs, and red bone marrow, and is calculated using the tissue weighting factor (wT).

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is likely a distractor and does not represent a valid effective dose for a chest x-ray. Without a specific value, it is difficult to evaluate its accuracy.

**Option B:**
This option is incorrect because it is too high to be the effective dose of a chest x-ray. A dose of 10 mSv would be more typical of a computed tomography (CT) scan of the chest.

**Option C:**
This option is incorrect because it is too low to be the effective dose of a chest x-ray. A dose of 0.01 mSv would be more typical of a plain radiograph of the hand.

**Clinical Pearl / High-Yield Fact**
When ordering or interpreting medical imaging procedures, it is essential to consider the effective dose and weigh the benefits against the risks of radiation exposure. The ALARA principle (As Low As Reasonably Achievable) should be applied to minimize radiation doses whenever possible.

**Correct Answer: D. 0.1 mSv.**