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 diagnostic sign of pregnancy is : 
Select and explain. 
A. Amenorrhoea, B. Quickening, C. Foetal hea sounds, D. Distention of abdomen
C: Foetal hea sounds
Answer: C: Foetal hea sounds 
Explanation: Foetal hea sounds