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 fetal diameter is : 
Select and explain. 
A. Biparietal, B. Bitemporal, C. Submentobregmatic, D. Occipito frontal
B: Bitemporal
Answer: B: Bitemporal 
Explanation: Bitemporal