What is the main difference between October heat and loo?

Correct answer: October heat is humid discomfort and loo is hot dry wind

Direct answer: Option A is correct. Loo is a strong, hot, dry wind that commonly blows over northern and northwestern India during the hot pre-monsoon summer, especially in May and June. October heat is different: after the southwest monsoon starts retreating, skies may clear, temperatures remain high, and moisture left in the air makes the weather hot and humid and therefore uncomfortable. Step by step, loo means dry heated air moving as a wind; October heat means high temperature combined with humidity after monsoon withdrawal. Option A states this distinction correctly. Option B is wrong because a cold wave is a sudden period of unusually low temperature. Option C is wrong because frost forms in very cold conditions, not as either of these features. Option D reverses the facts: loo is not a humid sea wind, and October heat is not snowfall. Exam cue: remember “loo = hot and dry”; “October heat = hot and humid.”