**Core Concept**
Takayasu arteritis is a form of large vessel vasculitis that primarily affects the aorta and its major branches. It is a chronic inflammatory disease characterized by granulomatous inflammation and stenosis or occlusion of the involved vessels.

**Why the Correct Answer is Right**
The most common arteries involved in Takayasu arteritis are the subclavian and pulmonary arteries. The inflammation typically starts in the aorta and then extends to its branches, including the subclavian arteries. This leads to stenosis or occlusion of these vessels, resulting in symptoms such as arm claudication, hypertension, and reduced pulse in the affected arm. The inflammation can also involve the pulmonary arteries, leading to pulmonary hypertension.

**Why Each Wrong Option is Incorrect**
**Option A:** Not specified - Incorrect because the question asks for the most common artery involved, and the correct answer is not listed.
**Option B:** Not specified - Incorrect because the question asks for the most common artery involved, and the correct answer is not listed.
**Option C:** Not specified - Incorrect because the question asks for the most common artery involved, and the correct answer is not listed.
**Option D:** Not specified - Incorrect because the question asks for the most common artery involved, and the correct answer is not listed.

**Clinical Pearl / High-Yield Fact**
In Takayasu arteritis, the involvement of the subclavian and pulmonary arteries can lead to a characteristic "pulseless disease," where the patient has reduced or absent pulses in the affected arm.

**Correct Answer:** C.