**Core Concept**
The **bronchial veins** are part of the bronchial circulation, which supplies the airways and other structures of the lung. Understanding the anatomy of these veins is crucial for diagnosing and managing conditions affecting the lung and its vasculature. The right bronchial vein's drainage is a key aspect of this anatomy.

**Why the Correct Answer is Right**
The right bronchial vein typically drains into the **azygos vein**, which is a significant vein in the thoracic cavity that collects blood from the bronchial veins among other sources. This pathway is part of the systemic venous circulation, ultimately returning deoxygenated blood to the heart.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because the right bronchial vein does not typically drain into the **superior vena cava** directly.
**Option B:** Incorrect as the **hemiazygos vein** primarily drains the left side of the thorax.
**Option D:** Incorrect because the **pulmonary veins** are responsible for carrying oxygenated blood from the lungs to the left atrium, not deoxygenated blood from the bronchi.

**Clinical Pearl / High-Yield Fact**
Remembering that the bronchial veins, including the right bronchial vein, drain into the systemic circulation (via the azygos system) and not into the pulmonary veins is crucial for understanding lung pathology and the spread of disease.

**Correct Answer:** C. azygos vein.