This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
Milk teeth--Total no. in human being: 
Select and explain. 
A. 20, B. 28, C. 32, D. 24
A: 20
Answer: A: 20 
Explanation: a. 20(Ref: Nelson's 20/e p 1768-1771, Ghai 8/e p 11)Primary dentition comprises of 20 teeth, which begins at 6 months of age and completes by 3 years.