The correct option is A Based on size
Drugs are mainly classified on the basis of four criteria, namely pharmacological effect, drug action, chemical structure and molecular targets in the body.
On the basis of pharmacological effect:
This classification is based on pharmacological effect of the drugs. It is useful for doctors because it provides them the whole range of drugs available for the treatment of a particular type of problem.
On the basis of drug action:
It is based on the action of a drug on a particular biochemical process.
On the basis of chemical structure:
It is based on the chemical structure of the drug. Drugs classified in this way share common structural features and often have similar pharmacological activity.
On the basis of molecular targets:
Drugs usually interact with biomolecules such as carbohydrates, lipids, proteins and nucleic acids. These are called target molecules or drug targets.