This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetal Skull and Maternal Pelvis, Subject name: Gynaecology & Obstetrics
Shortest diameter of pelvis is- 
Select and explain. 
A. Bispinous, B. Antero-posterior, C. Oblique, D. Transverse
A: Bispinous
Answer: A: Bispinous 
Explanation: Ans. is 'a' i.e., Bispinous