Electrolytes (what they are): Electrolytes are minerals in the body that carry an electric charge and help control nerve function, muscle contraction, and fluid balance.
Potassium (what it is): Potassium is a major electrolyte found mainly inside cells. It is essential for normal heart rhythm, nerve signals, and muscle function.
Why it is correct: It is one of the key major electrolytes along with sodium, calcium, and chloride.
Other Options:
Vitamin D → vitamin, not electrolyte
Urea → waste product
Glucose → sugar, energy source
Final Point: Potassium is a major electrolyte in the body.
Correct answer: (A) Potassium
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