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: Pediatrics
By____________years all milk teeth are erupted ? 
Select and explain. 
A. 1.5, B. 2, C. 2.5, D. 3
C: 2.5
Answer: C: 2.5 
Explanation: Ans. is 'c' i.e., 2.5 o Between 20-30 months all milk (primary) teeth are erupted.