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A patient suffering from cholera is given saline drip because

1. Cl⁻ ions are important component of blood plasma
2. Na⁺ ions help to retain water in the body
3. Na⁺ ions are important in transport of substances across membrane
4. Cl⁻ ions help in the formation of HCl in stomach for digestion

Correct answer: Na⁺ ions help to retain water in the body

Solution

In cholera, the body loses large amounts of water and salts through diarrhea, so saline drip helps restore fluid balance. Sodium ions are key for osmotic balance, so they help the body retain water and rehydrate tissues.

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