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
All are positive signs of pregnancy except : 
Select and explain. 
A. Vomiting, B. Fetal movements, C. Fetal hea sounds, D. Excessive salivation
D: Excessive salivation
Answer: D: Excessive salivation 
Explanation: Excessive salivation