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It is not advised to sleep in a closed room with fire burning inside as it could be fatal because 

(a) excessive heat 

(b) non-availability of oxygen 

(c) Hb has higher affinity to CO 

(d) combined effect of (b) and (c)

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Correct option: (d) combined effect of (b) and (c)

Incomplete combustion of charcoal/coal produces carbon monoxide that has greater affinity for haemoglobin than oxygen. Thus, the person dies of asphyxiation.

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