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
Early childhood caries or baby bottle tooth decay is usually seen in the age group of _____ month old child? 
Select and explain. 
A. 18-36, B. 24-36, C. 18-Jun, D. 18-Dec
A: 18-36
Answer: A: 18-36 
Explanation: Early childhood caries or baby bottle tooth decay is usually seen in the 18 to 36 month old child, although it can be seen even in younger patients.