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.
Why did the doctor sterilise the syringe?
For the reasons mentioned above, the doctor sterilised the syringe.