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# Study of interaction of antigen and antibody in blood is

$\begin{array}{1 1}(A)\;\text{Haemotology}\\(B)\;\text{Serology}\\(C)\;\text{Cryobiology}\\(D)\;\text{Angiology}\end{array}$

Study of interaction of antigen and antibody in blood is serology
Hence (B) is the correct answer.