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: Microbiology
Best method of sera sterilization is: 
Select and explain. 
A. Filtration, B. Autoclaving, C. Radiation, D. Heating
A: Filtration
Answer: A: Filtration 
Explanation: Filtration is the best method of sterilization of heat labile liquids such as sera and solutions of sugars or antibiotics, toxins and vaccines. It helps to remove bacteria.