VMC-0059
QUESTION
Name of the test described below:
(a) Mixing of soluble antigen with strong antiserum (reactant).
(b) The mixture becomes cloudy and flocculent.
(c) The reactants are in optimal proportions in such that the lattice formed becomes insoluble.
OPTIONS
(A) Agglutination
(B) Neutralization
(C) Precipitation
(D) Passive agglutination
ANSWER
(C) Precipitation
EXPLANATION
The described reaction involves a soluble antigen interacting with a specific antiserum to form an insoluble lattice that becomes visibly cloudy or flocculent in the zone of equivalence. This is a precipitation reaction. Therefore option C is correct; agglutination requires particulate antigen, neutralization measures functional inhibition, and passive agglutination uses carrier particles.