Choose the wrong statement.

Fill in the blanks:
$(a)$ Pneumonia is an example of . . . . . . disease.
$(b)$ Many skin diseases are caused by . . . . . . .
$(c)$ Antibiotics commonly block biochemical pathways important for the growth of . . . . . . .
$(d)$ Living organisms carrying the infecting agents from one person to another are called . . . . . . .

Vectors can be defined as

Why do some children fall ill more frequently than others living in the same locality?

You are aware of the $Polio$ $Eradication$ $Programme$ in your city. Children are vaccinated because:

Define an infectious disease. Give any one example of it.