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 following statements are related to occipitopos- terior except: 
Select and explain. 
A. Malrotation of occiput may cause occipitosacral arrest, B. 10% cases are associated with anthropoid or android pelvis, C. Incomplete forward rotation of occiput may cause deep transverse arrest, D. Nonrotation of occiput may cause are associated
B: 10% cases are associated with anthropoid or android pelvis
Answer: B: 10% cases are associated with anthropoid or android pelvis 
Explanation: All the options given in the question are correct except – option b
“In more than 50%, the occipitoposterior position is associated with either on anthropoid or android pelvis”
Dutta Obs 7/e, p 365