Which country's astronomers have detected huge optical flare in a black hole 'BL Lacertae'?

1. 

Which country's astronomers have detected huge optical flare in a black hole 'BL Lacertae'?
[A]. Russia
[B]. US
[C]. India
[D]. UK

Answer: Option C

Explanation:

The Indian astronomers have reported one of the strongest flares from a feeding super massive black hole or blazar called BL Lacertae.

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