Concept:Fasting is obligatory for every sane, healthy adult Muslim, and only genuine excuses grant exemption.
Explanation:Islamic law exempts certain people from fasting during Ramadan.
The insane person is exempted because they are not held accountable for religious duties.
The menstruating person is exempted and must make up the missed days later.
The sick person is exempted when fasting may worsen their health.
However, being rich does not exempt a person from fasting.
Wealth has no effect on the obligation to fast.
A rich man must fast like every other healthy adult Muslim.
He is still fully responsible for all acts of worship.
Therefore, among the options listed, the rich man is the one who is not exempted from fasting.
Answer:C. Rich man.