This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Reaction of soluble antigen with antibody is known as - 
Select and explain. 
A. Agglutination, B. Precipitation, C. Flocculation, D. Complement fixation
B: Precipitation
Answer: B: Precipitation 
Explanation: When a soluble antigen combines with its antibody in the presence of electrolytes at a suitable temperature and pH, the antigen-antibody complex form an insoluble precipitate. This is called precipitation reactions. Reference:Anathanarayan & paniker's 9th edition, pg no: 105 <\p>