പോളിയോ നിർമാർജനം ആരംഭിച്ചത് ഏത് വർഷം ?
A1974
B1978
C1979
D1988
A1974
B1978
C1979
D1988
Related Questions:
Which of the following statements are true?
1.An antibody is an disease causing agent that the body needs to remove.
2.An antigen, also known as an immunoglobulin is a large, Y-shaped protein used by the immune system to identify and neutralize foreign objects such as pathogenic bacteria and viruses.