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: Pharmacology
Agents/Drugs which help in rapid coagulation of Blood 
Select and explain. 
A. Astringents, B. Styptics, C. Haemostatics, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None