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B
Carbonic acid
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C
Citric acid
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D
Sulphuric acid
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Solution
The correct option is D Citric acid Lemon is sour due to the presence of citric acid. The presence of citric acid strengthens the immune response. Citric acid is the important constituents of the metabolic activity of the aerobic organism. It is metabolized by the Kerb's cycle in the mitochondria.