This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology (Sterilization and Bacterial Genetics), Subject name: Microbiology
Which of the following is best to sterilize heat labile solutions? 
Select and explain. 
A. Dry heat, B. Autoclave, C. Membrane filtration, D. Pasteurization
C: Membrane filtration
Answer: C: Membrane filtration 
Explanation: Heat sensitive liquids like serum, vaccines, antisera, enzymes, antibiotic solutions and urea solutions can be sterilized by using membrane filtration. The filtration can be aided by using either positive or negative pressure