Which element is present in the least amount in a living body?
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Aluminium
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Manganese
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Sodium
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Potasium
B
Correct answer
Explanation
Manganese is a trace element present in very small quantities in the human body (10-20 mg), unlike sodium and potassium which are macrominerals present in much larger amounts (100-140 g). Aluminium is not considered essential for human life. Trace elements like manganese are required in minute quantities for proper enzyme function.