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B
Chloride
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C
Potassium
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D
Phosphate
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Solution
The correct option is D Sodium Body fluids are the medium of transport in the body. In an average 70 kg adult human, the total body water is about 60% of the body weight or about 42 litres. Body fluid is of two types: intracellular fluid and extracellular fluid. The extracellular fluid contains a large amount of sodium ions. It is the most abundant mineral present in body fluid. It helps in controlling the amount of fluid. 60 percent of the total sodium present in body is found only in the body fluids.