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Which of the following is the disadvantage of helium, which can be used as carrier gas in gas chromatography?

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Which of the following is the disadvantage of helium, which can be used as carrier gas in gas chromatography?

(a) Dangerous to use

(b) Expensive

(c) Reduced sensitivity

(d) High density

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The question is from Gas Chromatography topic in portion Chromatography of Analytical Instrumentation

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The correct answer is (b) Expensive

The explanation is: Helium is expensive. Its advantages are that it has low density and it allows greater flow rates.

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