The heart of which among the following reptiles has four chambers?

Blood flow in crocodiles is different from that of other reptiles like wall lizards, calotes, king cobras, etc. 

Crocodiles have a four-chambered heart that keeps oxygenated and deoxygenated blood separate. This allows for a more efficient flow of blood throughout their body which helps crocodiles to maintain a constant body temperature, even in cold water.