An Active galactic "nucleus" emitting radio waves-
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Quasar
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Pulsar
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Neutron star
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Dwarf Star
A
Correct answer
Explanation
A quasar is an extremely luminous active galactic nucleus powered by a supermassive black hole. They emit enormous energy across the electromagnetic spectrum, especially in radio frequencies. Pulsars and neutron stars are different objects - rotating stellar remnants, not galactic nuclei.