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Ravi visited a blood donation camp in a village. In spite of a syringe being available in the camp, he purchased a new syringe from a chemist. There he saw the doctor sterilising the syringe before it is being administered to other people. In the camp, he also came to know that he is a universal donor.
(i) He took that precaution against an infectious disease/s. Identify it/them.
(ii) Why did the doctor sterilize the syringe?
(iii) What is the blood group of Ravi?