This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis of Pregnancy, Subject name: Gynaecology & Obstetrics
Dusky hue of vestibule and ant vaginal wall is 
Select and explain. 
A. Chadwick sign, B. Osiandersign, C. Goodel sign, D. Hegar sign
A: Chadwick sign
Answer: A: Chadwick sign 
Explanation: Ans. (a) Chadwick sign