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
Deep transverse arrest is MOST commonly seen in which of the following type of pelvis? 
Select and explain. 
A. Anthropoid pelvis, B. Android pelvis, C. Gynaecoid pelvis, D. Platypelloid pelvis
B: Android pelvis
Answer: B: Android pelvis 
Explanation: The android pelvis has a wedge-shaped inlet, a narrow fore pelvis, a flat posterior segment, and a narrow sacrosciatic notch, with the sacrum inclining forward. The side walls converge, and the bones are medium to heavy in structure. Diameter of engagement is transverse or oblique. Anterior rotation is difficult in android type. Chance of arrest is present. Ref: Textbook of Obstetrics by D C Dutta, 6th edition, Page 346.