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
Which is the commonest diameter of engagement- 
Select and explain. 
A. Suboccipitofrontal, B. mentovertical, C. Occipito frontal, D. Submento vertical
A: Suboccipitofrontal
Answer: A: Suboccipitofrontal 
Explanation: Ans. is 'a' ie. Sub occipitofrontal Commonest diameter of engagement Antero-posterior diameter - Sub occipito bregmatic* orSub occipitofrontal* Transverse diameter - Biparietal*