Which organ of the body is affected most on keeping fast for a long time?

The correct answer is (d) Kidney.

The kidney is the organ of the body that is affected most on keeping fast for a long time. This is because the kidney is responsible for filtering the blood and removing waste products from the body. When you fast, your body goes into a state of ketosis, which means that it starts to break down fat for energy. This process produces ketones, which are waste products that the kidney has to filter out of the blood. If you fast for a long time, your kidneys can become overloaded with ketones, which can lead to kidney damage.

The other options are incorrect because they are not the organs that are most affected by fasting. The heart is responsible

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