This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
On a primary 2nd molar caries occur most commonly on 
Select and explain. 
A. Occlusal pit and fissures, B. Proximal caries below contact point, C. Buccal surface, D. Promixal caries above contact point
A: Occlusal pit and fissures
Answer: A: Occlusal pit and fissures 
Explanation: None