What is BL Lacertae, recently seen in news?

A. A supermassive black hole or blazar

B. A ransomware

C. New Supercomputer developed by China

D. None of these

Explanation:

Indian astronomers have reported one of the strongest flares from a feeding super massive black hole or blazar called BL Lacertae, analysis of which can help trace the mass of the black hole and the source of this emission. Blazars or feeding supermassive black holes in the heart of distant galaxies receive a lot of attention from the astronomical community because of their complicated emission mechanism.