Fact 1: Amphibians have a relatively complex circulatory system with a three-chambered heart. Fact 2: All frogs are amphibians. Given the two facts above, what has a relatively complex circulatory system with a three-chambered heart?

Options:
[I] sharks.
[II] pan.
[III] frogs.
[IV] Man.
[V] Birds.
[VI] alpacas.
[VII] salmon.
[VIII] a fish.
Answer:
[III]