………… was the 1st underground railway system in India.
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Calcutta Metro
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Delhi Metro
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Bangalore Metro
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Chennai Metro
A
Correct answer
Explanation
The Kolkata Metro, formerly known as the Calcutta Metro, began operations in 1984 as India's first underground railway. It was a pioneering project that aimed to alleviate the extreme traffic congestion in the city. Other metro systems in Delhi and Bangalore were developed much later in the 2000s.