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
Arrange the above milestones in ascending order of appearance (starting from earliest to later milestones): 
Select and explain. 
A. D - A - C - B, B. D - C - A - B, C. A - C - D - B, D. A - D - C - B
A: D - A - C - B
Answer: A: D - A - C - B 
Explanation: a. D - A - C - B(Ref: Nelson's 20/e p 65-77, Ghai 8/e p 45-49))A. shows mouthing that comes at 5 months.B. shows spontaneous scribbling, that appears at 15 months.C. shows Pivotting that appears around 7 months.D. shows rounded back on made to sit, that is seen at 3 months.So, the correct sequence of the given milestones is D - A - C - B.