The correct option is B Serology
Cryobiology is the branch of biology that studies the effects of low temperatures on living things.
Serology is the scientific study of plasma serum and other bodily fluids. Studying antigens and antibodies interaction will be considered under serology.
Haematology is the branch of medicine concerned with the study, diagnosis, treatment and prevention of diseases related tot he blood.
Angiology is the study of diseases of the circulatory system.
So, the correct answer is an option B.