A sac-like structure specialised to receive venus blood is called
Conus arteriosus
Sinus venosus
Conus venosus
Sinus arteriosus
Extra info- In this type of heart of fish, sinus venosus and conus arteriosus are present. The sinus venosus is a sac-like structure specialised to receive venus blood. It opens into the auricle. The conus arteriosus is another similar sac into which ventricles open for distribution of blood.
Hence, the correct answer is option b.