This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Social and Language Milestones, Subject name: Pediatrics
A child plays a simple ball game at: 
Select and explain. 
A. 52 weeks, B. 36 weeks, C. 12 weeks, D. 40 weeks
A: 52 weeks
Answer: A: 52 weeks 
Explanation: Playing a simple ball game comes at 1 year or 52 weeks.