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
Which of the following measurement at pelvic inlet can be assessed directly : 
Select and explain. 
A. Obstetric conjugate, B. Diagonal conjugate, C. Anatomical conjugate, D. Bisspinous conjugate
B: Diagonal conjugate
Answer: B: Diagonal conjugate 
Explanation: Diagonal conjugate