Choose the odd one out.
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Ankleshwar
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Digboi
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Kohima
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Naharkatia
Ankleshwar, also famous as Gujarat's “City of Oil” is known for its industrial township called Gujarat Industrial Development Corporation (GIDC).
Digboi is known as the Oil City of Assam where the first oil well in Asia was drilled. The first refinery was started here as early as 1901.
Naharkatia (also spelled as Naharkatia or Nahorkatiya) is a town and a town area committee in Dibrugarh district in the Indian state of Assam. It is well known for its petroleum and gas reserves. Earlier, Duliajan, the head office town of Oil India Limited was in its circle.
Kohima was originally known as Kewhira, It is called after the wild flowering plant Kewhi, found in the mountains.
So cities other than Kohima are associated with oil/petroleum.