**Core Concept**
The question is testing the knowledge of the number of germ teeth present in a full-term fetus, which is a fundamental concept in embryology and pediatric dentistry. **Germ teeth** are the tooth buds that develop in the fetus, and their total count is crucial for understanding tooth development and eventual eruption in infants.

**Why the Correct Answer is Right**
In a full-term fetus, the germ teeth develop and are present in the jawbone. The total number of germ teeth is 20, which includes 8 incisors, 4 canines, and 8 molars (including 4 first molars and 4 second molars). This number is based on the embryological development of the dentition and is a critical point for pediatric dentists and orthodontists to understand the normal development and eruption of teeth in children.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.
* **Option D:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the number of germ teeth in a full-term fetus is 20, which includes 8 incisors, 4 canines, and 8 molars. This knowledge is crucial for understanding tooth development, eruption, and any potential issues that may arise during childhood.

**Correct Answer:** D. 20