What is the ratio of the gases in medical air?

(a) 78% Nitrogen, 21 % oxygen

(b) 75 % Oxygen, 25 % Carbon dioxide

(c) 60% Nitrogen, 20% Oxygen, 20% Carbon Di oxide

(d) 50% Nitrogen, 50% Oxygen

I had been asked this question in final exam.

Query is from Organization of Theaters topic in chapter Anaesthesia of Clinical Science

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