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 most impoant point of reference in the use of forceps is : 
Select and explain. 
A. The Plane of greatest dimension, B. Posterior sagittal diameter, C. Pelvic axis, D. Station of biparietal diameter
D: Station of biparietal diameter
Answer: D: Station of biparietal diameter 
Explanation: Station of biparietal diameter