Saline solution is given to patients of cholera because :

Saline solution is given to patients of cholera because :
A $Na^+$ prevents water loss from body
B NaCl functions as regulatory material
C NaCl produces energy
D NaCl is antibacterial

Detailed Solution

Cholera causes severe watery diarrhoea, so the body loses a lot of water and salts (especially $Na^+$), leading to dehydration.
Saline (salt and water, often with glucose as ORS) replaces the lost water and salts. Sodium ions help retain water in the body (by osmosis) and restore the fluid balance.
So saline is given because $Na^+$ prevents water loss from the body.

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