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Must Be True. The correct answer choice is (C)
Since this is an ordinary fact-set stimulus and not an argument, the Must Be True question requires us to put the facts together in some meaningful way and come up with a valid conclusion.
The author states that in rheumatoid arthritis, the immune system malfunctions by attacking the joints. The resulting damage activates a hormone that causes swelling and pain, which is normally released only in reaction to injury or infection. Since the new drug seeks to alleviate these symptoms by inhibiting the functioning of the hormone responsible for them, we can expect that a patient taking the drug will not experience swelling and pain regardless of what their cause is. Answer choice (C) is therefore correct.
Answer choice (A): This answer concludes that the new drug will repair the cell damage caused by arthritis. The author's statements do not support this answer, since all we know about the drug is that it stops the function of the hormone responsible for pain and swelling.
Answer choice (B): The stimulus makes no mention of what the drug's side effects might be, which is why we cannot tell whether the benefits of taking it would outweigh the costs. This answer choice is therefore incorrect.
Answer choice (C): This is the correct answer choice. Since the drug inhibits a pain-inducing hormone that is normally released in response to joint injury, it will likely eliminate the symptoms of any joint damage, regardless of cause. If one has no pain or swelling, it might be impossible to know if injury has occurred. Notice the precision with which test makers expressed the likelihood of this occurrence: the patient could sustain a joint injury without becoming aware of it. We do not know whether the inhibited hormone is the only factor responsible for alerting the patient of any damage to her joints.
Answer choice (D): Hopefully you were able to discount this answer choice pretty quickly. The drug's only stated ability is to inhibit a hormone released during joint damage. Lupus and diabetes are different diseases that cause damage to other parts of the body and cause completely different symptoms, which may or may not be caused by the same hormone. This answer choice is incorrect.
Answer choice (E): The author does not indicate whether this drug can be used to treat other joint-related diseases. If any other joint disease causes cell damage that releases the hormone in question, it is perfectly possible that such disease would be affected by this medication. This answer choice is incorrect.