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
True pelvis refers to : 
Select and explain. 
A. Upper pa of pelvis, B. Lower pa of pelvis, C. Either of these, D. Neither
B: Lower pa of pelvis
Answer: B: Lower pa of pelvis 
Explanation: Lower pa of pelvis