Q: Fact 1: Fish have a circulatory system with a two-chambered heart. Fact 2: Fish species include salmon and trout. Given the two facts above, what has circulatory system with a two-chambered heart?

Select from the following.
a). sharks
b). trout
c). pan
d). toads
e). Birds
f). animals
g). mammals
h). Man
A:
b).