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: Dental
Which of the following is not used as hemostatic agent during furcation repair? 
Select and explain. 
A. Ca(OH)2, B. Ferric sulphate, C. Calcium sulphate, D. Collagen
B: Ferric sulphate
Answer: B: Ferric sulphate 
Explanation: None