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
Implantation bleeding is called : 
Select and explain. 
A. Haman's sign, B. Arias stella's sign, C. Hoffman's sign, D. Reinz's sign
A: Haman's sign
Answer: A: Haman's sign 
Explanation: Haman's sign