Question

Which of the following most logically completes the argument below?

Using antibiotics to kill Toxoplasma, a parasite that attacks animals with a weak immune system, presents a difficulty: how to keep the immune system from being damaged along with the parasite. For at least some species of animals, a special medicine that prevents antibiotic-based damage of the immune system, is being developed. This protection wears off as the animal matures. Therefore, the special medicine will be especially useful for Toxoplasma-vulnerable animals that ___

• A. carry their newborn babies inside of them over an extended period of time, as elephants do
• B. produce chemicals simulating the effect of the special medicine after several treatments
• C. produce, as they develop beyond puberty, immune cells strong enough to keep Toxoplasma from surviving
• D. are raised in large-scale indoor confinement operations, as chickens are
• E. are kept outdoors inhabiting free-ranging environments

Answer 1

The correct option is C produce, as they develop beyond puberty, immune cells strong enough to keep Toxoplasma from surviving

The medicine is useful for "Toxoplasma-vulnerable animals" until they are no longer "Toxoplasma-vulnerable".