This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
Length of CBD 
Select and explain. 
A. 2.5 -5 cm, B. 5-7 cm, C. 7-11 cm, D. 10-15 cm
C: 7-11 cm
Answer: C: 7-11 cm 
Explanation: .