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
To obtain true conjugate, the following factor should be substracted from the diagonal conjugate : 
Select and explain. 
A. 0.5 cm, B. 1.2 cm, C. 2.5 cm, D. 3.0 cm
B: 1.2 cm
Answer: B: 1.2 cm 
Explanation: 1.2 cm