**Core Concept**
Adrenal metastasis from bronchogenic carcinoma is a common occurrence, and early detection is crucial for management. The sensitivity of imaging modalities varies, and the correct choice requires an understanding of the characteristics of different imaging techniques.

**Why the Correct Answer is Right**
The scan with the highest sensitivity to detect adrenal metastasis due to bronchogenic carcinoma is the **18F-FDG PET/CT**. This is because **18F-FDG PET/CT** has high sensitivity for detecting metabolically active tumors, which is characteristic of most bronchogenic carcinomas. The **18F-FDG PET/CT** scan takes advantage of the increased glucose metabolism in cancer cells, which leads to increased uptake of **18F-FDG**. This allows for the detection of small adrenal metastases, even when they are not visible on conventional imaging modalities like CT or MRI.

**Why Each Wrong Option is Incorrect**
**Option A:** **CT Scan** is less sensitive than **18F-FDG PET/CT** for detecting adrenal metastases, especially small ones.
**Option B:** **MRI** is not the most sensitive modality for detecting adrenal metastases from bronchogenic carcinoma.
**Option C:** **Bone Scan** is not typically used for detecting adrenal metastases.

**Clinical Pearl / High-Yield Fact**
When evaluating adrenal masses in patients with bronchogenic carcinoma, it is essential to consider the possibility of metastasis and to use **18F-FDG PET/CT** to detect small lesions.

**Correct Answer:** C.