The correct option is B a-ii, b-iii, c-i
∙The diseases that occur over a period of time and last longer, or even for lifetime are called chronic diseases. For example, tuberculosis.
∙Certain diseases occur suddenly and last only for a few days. These are known as acute diseases. For example, common cold.
∙Hereditary diseases are inherited or passed on from one generation to another. For example, down's syndrome.