The symptoms of hepatitis A appear no earlier than 60 days after a person has been infected. In a test of a hepatitis A vaccine, 50 people received the vaccine and 50 people received a harmless placebo. Although some people from each group eventually exhibited symptoms of hepatitis A, the vaccine as used in the test is completely effective in preventing infection with the hepatitis A virus.

Which one of the following, if true, most helps resolve the apparent discrepancy in the information above?

Answer Choices

Correct answer marked below

The placebo did not produce any side effects that resembled any of the symptoms of hepatitis A.

More members of the group that had received the placebo recognized their symptoms as symptoms of hepatitis A than did members of the group that had received the vaccine.

The people who received the placebo were in better overall physical condition than were the people who received the vaccine.

The vaccinated people who exhibited symptoms of hepatitis A were infected with the hepatitis A virus before being vaccinated.

Correct

Of the people who developed symptoms of hepatitis A, those who received the vaccine recovered more quickly, on average, than those who did not.

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What this question tests

What it tests

Whether you can explain an apparent contradiction in a way that makes both facts true.

Common trap

Picking an option that explains one side of the paradox while making the other side false.