**Core Concept**
Calcification in anterior mediastinal masses is a radiological finding that can be caused by various conditions. The anterior mediastinum contains the thymus gland, lymph nodes, and thyroid gland, which can give rise to calcifications in certain pathologies.

**Why the Correct Answer is Right**
Thymic carcinoids are a rare type of tumor that can occur in the thymus gland, and they are known to cause calcification in anterior mediastinal masses. This is due to the presence of calcium deposits within the tumor cells. Thymic carcinoids can be differentiated from other anterior mediastinal masses by their characteristic imaging features and clinical presentation.

**Why Each Wrong Option is Incorrect**
**Option A:** Thymomas are a common cause of anterior mediastinal masses and can exhibit calcification. Therefore, this option is incorrect.
**Option B:** Lymphoma can also cause calcification in anterior mediastinal masses, especially after radiation therapy. Thus, this option is incorrect.
**Option C:** Teratomas are a type of germ cell tumor that can occur in the anterior mediastinum and can exhibit calcification. Therefore, this option is incorrect.

**Clinical Pearl / High-Yield Fact**
When evaluating an anterior mediastinal mass, it's essential to consider the imaging characteristics and clinical presentation to narrow down the differential diagnosis. A thorough history and physical examination can help identify the likely cause of the calcification.

**Correct Answer: C. Teratomas are a type of germ cell tumor that can occur in the anterior mediastinum and can exhibit calcification.**