**Core Concept**
Radiation caries, also known as radiation-induced caries, is a type of dental caries that occurs in individuals undergoing radiation therapy, particularly in the head and neck region. This condition is characterized by an increased susceptibility to tooth decay due to the adverse effects of radiation on the oral mucosa and dental structures.

**Why the Correct Answer is Right**
The most common pattern of radiation caries is the "bucco-lingual" pattern, which involves the surfaces of the teeth facing the cheek and tongue. This occurs because the radiation beam often targets the oral mucosa, leading to a decrease in saliva production, which in turn reduces the buffering capacity of the mouth against acid production by oral bacteria. The lack of saliva also impairs the remineralization process, making teeth more susceptible to caries. Furthermore, the radiation can cause damage to the dental pulp, leading to increased sensitivity and further contributing to the development of caries.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the "occlusal" pattern, which involves the biting surfaces of the teeth, is not the most common pattern of radiation caries.
**Option B:** This option is incorrect because the "interproximal" pattern, which involves the spaces between teeth, is not specifically associated with radiation caries.
**Option C:** This option is incorrect because the "palatal" pattern, which involves the roof of the mouth, is not the most common pattern of radiation caries.

**Clinical Pearl / High-Yield Fact**
Radiation caries can be prevented or minimized by maintaining good oral hygiene, using fluoride toothpaste and mouthwashes, and receiving regular dental check-ups. Patients undergoing radiation therapy should also be advised to avoid sugary and acidic foods and drinks, and to stay hydrated to promote saliva production.

**Correct Answer:** C.