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Which is the world's oldest operating oil refinery?

Correct answer: B. Digboi

  • A. Bahamas
  • B. Digboi
  • C. Texas
  • D. Basra

Explanation

The Digboi Refinery in Assam, India, began refining oil in 1901 and is commonly described as the world’s oldest operating oil refinery. Its long history is linked to the early oil fields of northeastern India.

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