Which of the following characteristic features always holds true for the corresponding group of animals
`{:("(a)","Cartilagious endoskeleton",,"Chondrichthyes"),("(b)","Vivparous",,"Mammalia"),("(c)","Possess a mouth with an upper and a lower jaw",,"Chordata"),("(d)","3- chambered heart with one incompletely divided ventricle",,"Reptilia"):}`

Options

A. Vivparous - Mammalia
B. Possess a mouth with an upper and a lower jaw - Chordata
C. 3-chambered heart with one incompletely divided ventricle - Reptilia
D. Cartilaginous endoskeleton - Chondrichthyes

Answer

D

Explanation

Reptiles have 3-chambered heart except crocodiles. Mammals are viviparous except prototherian mammals, chordates have jaws except protochordates and cyclostomes.