This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
Impoance of the plane of midpelvis is 
Select and explain. 
A. Superior strait, B. Inferior strait, C. Plane of least pelvic dimensions, D. Plane of greatest pelvic dimensions
C: Plane of least pelvic dimensions
Answer: C: Plane of least pelvic dimensions 
Explanation: The pelvis is described as having four imaginary planes:The plane of the pelvic inlet--the superior strait. 2. The plane of the pelvic outlet--the inferior strait. 3. The plane of the midpelvis--the least pelvic dimensions. 4. The plane of greatest pelvic dimension--of no obstetrical significance.(Ref: William's Obstetrics; 25th edition)