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The world's first known city sanitation systems are linked to which civilisation?

AMesopotamian
BChinese
CEgyptian
DIndus Valley
Answer & Solution
Correct answer: D. Indus Valley
1. Harappa and Mohenjo-daro had wells and covered drains along main streets. 2. Waste water from bathing rooms flowed into these drains. 3. This is described as the world's first known city sanitation system. _Source: Wikipedia, Indus Valley Civilisation, Cities_
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