This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Labour - normal, abnormal, malposition, malpresentation and their management, Subject name: Gynaecology & Obstetrics
Engagement of fetal head is: 
Select and explain. 
A. When the occiput has gone below the pelvic inlet, B. When the widest diameter of the presenting pa has passed through the pelvic inlet, C. When the presenting pa can be pushed into the pelvic cavity, D. Synonymous with fixation of head
B: When the widest diameter of the presenting pa has passed through the pelvic inlet
Answer: B: When the widest diameter of the presenting pa has passed through the pelvic inlet 
Explanation: Engagement - The mechanism by which the widest diameter of he presenting pa such as the biparietal diameter in an occiput presentation--passes through the pelvic inlet. Deflexed head is the most common cause of non engagement, which indicates towards caeseran section