The oldest oil refinery in India is at

A Digboi, Assam
B Haldia, near Kolkata
C Koyali, near Baroda
D Noonmati, Assam

Correct Answer: Digboi, Assam

Digboi in Assam is an oil town that can be traced to the early 18th century, when oil was first discovered here. Digboi can proudly boast of two unique features: a 100-year-old extant oilfield and the world's oldest operating oil refinery.

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