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Science - biology

Match the types of immunity listed in Column I with the examples listed in Column II.
Choose the answer that gives the correct combination of alphabets of the two columns :
Column I                      Column II
Types of immunity      Example
A. Natural active          p. Immunity developed by heredity
B. Artificial passive     q. From mother to foetus through placenta
C. Artificial active         r. Injection of antiserum to travellers
D. Natural passive       s. Fighting infections naturally
                                   t. Induced by vaccination


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