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: Gynaecology & Obstetrics
Smallest diameter of true pelvis is: 
Select and explain. 
A. Interspinous diameter, B. Diagonal conjugate, C. True conjugate, D. Inteuberous diameter
A: Interspinous diameter
Answer: A: Interspinous diameter 
Explanation: Interspinous diameter