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 what age does a child achieve the following developmental milestone? 
Select and explain. 
A. 5 months, B. 6 months, C. 8 months, D. 9 months
B: 6 months
Answer: B: 6 months 
Explanation: Age


Milestones






4 months
6 months
9 months
10-12 months
12 months


Bidextrous grasp
Unidextrous / palmar grasp(Ulnar grasp)
Immature Pincer grasp
Palmar grasp (Radial grasp)
Mature Pincer grasp