Detailed explanation and options for the selected question.
Octopuses are invertebrates, not mammals. This question is contradictory. If it’s about invertebrates, the octopus is correct, but it’s not a mammal. Possibly we meant “cephalopod.” Let’s clarify in the description we meant the octopus is an invertebrate with large brain, not a mammal. (Trick question; describing a mismatch. )