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: Unknown
The shortest diameter of the pelvic inlet is - 
Select and explain. 
A. Obstetric conjugate, B. True conjugate, C. Diagonal conjugate, D. Transverse diameter
A: Obstetric conjugate
Answer: A: Obstetric conjugate 
Explanation: Ans-A