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: Forensic Medicine
Four carpal bones are present at what age? 
Select and explain. 
A. 3 years, B. 4 years, C. 5 years, D. 6 years
B: 4 years
Answer: B: 4 years 
Explanation: 4 years REF: Parikh 6' edition page 2.9 Between 2 to 6 years, the number of carpal bones present on X ray represents the approximate age in years, as for example, four carpal bones -- 4 years.