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
The engaging diameter in deflexed head is: 
Select and explain. 
A. Biparietal dirnaeter, B. Occipitofrontal diameter, C. Suboccipito bregamatic diameter, D. Bitemporal diameter
B: Occipitofrontal diameter
Answer: B: Occipitofrontal diameter 
Explanation: Occipitofrontal diameter