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
A child who can ride a tricycle, uses alternate steps while climbing stairs has attained a development age of: 
Select and explain. 
A. 2 years, B. 3 years, C. 4 years, D. 5 years
B: 3 years
Answer: B: 3 years 
Explanation: Ans. B. 3 yearsAt 3 years a child will be able to: ride a tricycle, use alternate steps while climbing stairs Shares toys, knows full name and gender