Which of the following factors affect human health?

Triazenes are derived from:

Which substance,when present in higher amounts in the body,leads to a fever-like condition?

The first dose of Oral Polio Vaccine $(OPV)$ and Hepatitis-$B$ vaccine is given to a child at:

What is a vector?

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.