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: Anatomy
Length of inguinal canal - 
Select and explain. 
A. 2.5 cm, B. 4 cm, C. 10 cm, D. 15 cm
B: 4 cm
Answer: B: 4 cm 
Explanation: None