The substance that is usually lost by the body during dehydration is-

Correct option is A

The substance sodium chloride (NaCl) is usually lost by the body during dehydration.

Explanation:
● Dehydration leads to a loss of electrolytes, primarily sodium and chloride, from the body through sweat and urine.
● Sodium chloride plays a vital role in maintaining fluid balance, nerve function, and muscle activity.
● When the body is dehydrated, replenishing lost sodium through oral rehydration solutions (ORS) or electrolyte drinks is essential.

Information Booster:
● Sodium chloride is the primary component of table salt and is crucial for maintaining blood pressure and hydration.
● Electrolyte imbalance due to dehydration can cause symptoms like fatigue, dizziness, and muscle cramps.
● Other important electrolytes include potassium and calcium.