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 fetal skull diameter is 
Select and explain. 
A. Bimastoid, B. Submentovertical, C. Submentobregmatic, D. Occipito-fronta!
A: Bimastoid
Answer: A: Bimastoid 
Explanation: Ans: A (Bimastoid) Ref: Dana textbook of obstetrics 5th ed pg 85Explanation: (See the following figure and table)