**Core Concept**
The most common site of metastasis for carcinoma of the bronchus is the lymph nodes, specifically those in the hilar and mediastinal regions. This is due to the direct lymphatic drainage of the bronchus into these nodes.

**Why the Correct Answer is Right**
The lymphatic drainage of the bronchus is primarily through the pulmonary lymphatic vessels, which then drain into the hilar and mediastinal lymph nodes. From these nodes, the cancer cells can spread to other parts of the body, including the contralateral lung, liver, adrenal glands, and bone. The lymph nodes in the mediastinum are particularly prone to metastasis due to their central location and high blood flow.

**Why Each Wrong Option is Incorrect**
**Option A:** The liver is a common site for metastasis, but it is not the most common site for carcinoma of the bronchus.

**Option B:** The adrenal glands can be involved in metastasis, but they are not the primary site for spread of bronchogenic carcinoma.

**Option C:** The bone is a common site for metastasis in various cancers, but it is not the most common site for carcinoma of the bronchus.

**Clinical Pearl / High-Yield Fact**
The most common sites for metastasis of carcinoma of the bronchus are the lymph nodes in the hilar and mediastinal regions, followed by the contralateral lung, liver, adrenal glands, and bone. This knowledge is crucial for accurate staging and treatment planning.

**Correct Answer: C. Bone is not the most common site, the correct answer is not given in the options. However, the most common site of metastasis of carcinoma bronchi is the lymph nodes, specifically those in the hilar and mediastinal regions.