A. Scoliodon, known as Dog fish, is found in Bay of Bengal.
B. Chimaera, known as rabbit fish, is found in deep sea.
C. Torpedo, known as electric ray, is a bottom living marine fish which is famous for discharging electricity.
D. Trygon, known as sting ray, resembles electric ray but it is devoid of electric organs.
A cartilaginous fish with an operculum (gill cover) is Chimaera.
So, the correct answer is 'Chimaera'.