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 commonest cause of occipitoposterior position of fetal head during labor is: 
Select and explain. 
A. Maternal obesity, B. Multiparity, C. Deflexion of fetal head, D. Android pelvis
D: Android pelvis
Answer: D: Android pelvis 
Explanation: In vertex presentation when the occiput is placed posteriorly over the sacroiliac joint or directly over the sacrum. It is called as occiptoposterior position.
Causes of Occipitoposterior Position:
Most common cause of occipitoposterior position is anthropoid and android pelvis: