What was the major contribution of Louis Pasteur to the field of biology?

Who stated that health is a state of body and mind where there is a balance of certain humors?

When do we realize that we are not healthy?

Which of the following statements are correct?
$(1)$ Yoga is practiced to achieve physical and mental health.
$(2)$ Infectious diseases are very common; all of us have suffered from one or the other at some time.
$(3)$ $AIDS$ is an infectious disease.
$(4)$ Cancer is a non-infectious disease.
$(5)$ $A$ healthy person contributes to economic prosperity.

What is the Pulse Polio Programme of the Government of India? What is $OPV$? Why is it that India is yet to eradicate Polio?

The chemical used in the National Malaria Eradication Programme is