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
Handedness gets firmly established by what age? 
Select and explain. 
A. 2 years, B. 2.5 years, C. 3 years, D. 3.5 years
C: 3 years
Answer: C: 3 years 
Explanation: Handedness begins at around 2 years.
It gets firmly established by 3 years.