What is the difference between an indication and a contraindication?
a) indications tell when a drug should be used, and contraindications tell when it should be avoided.
b) indications tell what type of drug should be used, and contraindications tell how it should be used.
c) indications tell what a drug is used for, and contraindications tell what a drug is not used for.
d) indications tell when drugs are used, and contraindications tell how the drugs are applied.