Which of the following differences between Chondrichthyes (cartilaginous fishes) and Osteichthyes (bony fishes) is incorrect?
- AChondrichthyes - Endoskeleton is cartilaginous,Osteichthyes - Endoskeleton is bony.
- BChondrichthyes - Respiration through $5-7$ pairs of gills,Osteichthyes - Respiration through $4$ pairs of gills.
- CChondrichthyes - Air bladder present,Osteichthyes - Air bladder absent.
- DChondrichthyes - Caudal fin is heterocercal (unequal),Osteichthyes - Caudal fin is homocercal (equal).
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