**Core Concept**
The question is testing the knowledge of the typical radiological features of central nervous system (CNS) tumors. Calcification is a significant radiological finding that can aid in the diagnosis of various CNS tumors. **Meningiomas, craniopharyngiomas, and oligodendrogliomas** are known for their high incidence of calcification.

**Why the Correct Answer is Right**
Meningiomas are the most common type of brain tumor showing calcification. **Calcification in meningiomas is due to the presence of psammoma bodies**, which are small, concentrically laminated calcifications. This characteristic feature helps in differentiating meningiomas from other CNS tumors.

**Why Each Wrong Option is Incorrect**
**Option A:** Craniopharyngiomas are indeed calcified tumors, but they are relatively rare compared to meningiomas. Their calcification pattern is typically more extensive and irregular.
**Option B:** Oligodendrogliomas are also calcified tumors, but they are less common than meningiomas and typically show a more diffuse, punctate calcification pattern.
**Option C:** Astrocytomas are a type of glioma that can show calcification, but it is not as common as in meningiomas.

**Clinical Pearl / High-Yield Fact**
Remember that **calcification is a key radiological feature of meningiomas**, and it can help in differentiating them from other CNS tumors.

**Correct Answer: C. Oligodendrogliomas**