**Core Concept**
Radiation hazard to teeth can lead to a condition known as radiation-induced caries, where the enamel and dentin of the teeth are damaged, resulting in an increased susceptibility to decay. This occurs due to the loss of ameloblasts and odontoblasts, the cells responsible for enamel and dentin formation, respectively. The radiation damage disrupts the normal process of tooth development and mineralization.

**Why the Correct Answer is Right**
Radiation-induced caries are primarily seen in the molars and premolars, which are in the process of developing at the time of radiation exposure. The damage to the ameloblasts and odontoblasts leads to a lack of enamel and dentin formation, making the teeth more prone to decay. Additionally, radiation can cause changes in the oral environment, including xerostomia (dry mouth), which further increases the risk of caries.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specifically relate to the effects of radiation on teeth.
**Option B:** This option is incorrect as it is more related to the effects of radiation on the bone marrow and the resulting anemia.
**Option C:** This option is incorrect as it is more related to the effects of radiation on the salivary glands and the resulting xerostomia.

**Clinical Pearl / High-Yield Fact**
Radiation-induced caries can occur years after radiation exposure, making it essential for patients who have undergone radiation therapy to the head and neck region to receive regular dental check-ups and preventive care.

**Correct Answer:** C. Molars and premolars.