Must be false. We know sharks have a greater resistance to cancer than any other organism. So it’s impossible for some organisms to resist cancer as well as sharks.

Could be true. We know about how sharks’ cartilage ratio compares to other animals. But we don’t know about how one non-shark animal’s cartilage ratio compares to another non-shark animal.

Could be true. Sharks have a substance that inhibits tumor growth, but most other animals could have this, too. Sharks may just have more of this substance than other animals.

Could be true. Many therapies can help patients. Eating shark cartilage works as well or better than those therapies, though.

Could be true. The stimulus doesn’t tell us about the efficiency of a shark’s immune system. We know about resistance to cancer, but that doesn’t guarantee anything about overall immune system efficiency.