Vaccination is based on the principle of -: (A) Agglunation, (B) Phagocytosis, (C) Immunologic Memory, (D) Clonal Detection
Answer is C. Vaccination is aificial active immunity. Active immunity is associated with immunological memory. It is produced actively by host's immune system. Reference : Anathanarayan & paniker's 9th edition, pg no:82,83 <\p>