**Core Concept**
The question revolves around the obturation of deciduous teeth, which involves the removal of pulp tissue and the filling of the root canal space to prevent bacterial invasion and promote healing. In pediatric dentistry, the choice of obturation material is crucial due to the unique characteristics of deciduous teeth, including their smaller size, thinner dentin, and faster growth rates.

**Why the Correct Answer is Right**
The correct answer is **C. Zinc Oxide Eugenol (ZOE)** paste. ZOE paste is a widely used material for obturating deciduous teeth due to its biocompatibility, ease of use, and ability to promote healing. It is a mixture of zinc oxide and eugenol, which has antimicrobial properties and helps to prevent bacterial growth. The paste is also relatively inexpensive and easy to remove if necessary.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because **Calcium Hydroxide** is not commonly used for obturating deciduous teeth. While it has antimicrobial properties, it can be too harsh on the surrounding tooth structure and is often used for endodontic treatment in mature teeth.

**Option B:** This option is incorrect because **Gutta-Percha** is typically used for obturating mature teeth with larger canals and is not suitable for deciduous teeth due to its rigidity and potential to cause damage to the surrounding tooth structure.

**Option D:** This option is incorrect because **Silicones** are not commonly used for obturating deciduous teeth. While they have some antimicrobial properties, they are not as effective as ZOE paste in promoting healing and can be more difficult to remove.

**Clinical Pearl / High-Yield Fact**
When obturating deciduous teeth, it is essential to use materials that promote healing and are biocompatible. ZOE paste is a popular choice due to its ease of use and ability to prevent bacterial growth, making it an essential material to know for pediatric dentistry.

**Correct Answer:** C. Zinc Oxide Eugenol (ZOE) paste