## Core Concept
The eruption of primary teeth, also known as deciduous teeth, is a significant developmental milestone in infants. The sequence and timing of teething can vary among infants, but there is a general pattern. The **primary incisors** are usually the first to erupt.

## Why the Correct Answer is Right
The correct sequence of eruption for primary teeth starts with the **central incisors**, both mandibular (lower) and maxillary (upper), but typically, the **lower central incisors (mandibular central incisors)** are the first to erupt, usually around 6 months of age. This is followed by the eruption of the upper central incisors. This sequence is crucial for dental development and occlusion.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because, although it might represent a type of tooth, without specific identification, it's hard to directly refute, but generally, incisors are the first to erupt.
* **Option B:** This option suggests another tooth type and is incorrect because incisors precede other types of teeth in eruption.
* **Option D:** This option is incorrect because it does not accurately represent the first incisors to erupt.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the eruption of primary teeth begins around 6 months of age with the **lower central incisors**, and by 12-16 months, most infants have a set of 8 primary teeth (central and lateral incisors). Monitoring teething can provide insights into an infant's dental and overall health.

## Correct Answer: C.