AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(C) Steel
Production and consumption of steel is often regarded as the index of a country's development.
Source: Iron and Steel Industry, Chapter 6
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The textbook explicitly states: "Production and consumption of steel is often regarded as the index of a country's development." This is a direct fact — memorise the exact phrase. No other material (aluminium, cement, fertilizer) is described this way in the chapter.