In matrix-type transdermal DDS, how many of the following statements are correct?

• A. ALL statements are correct
• B. ONLY ONE statement is correct
• C. TWO statements are correct
• D. THREE statements are correct

Answer: (D)

This question tests self-referential logic: each statement talks about how many of the statements are true. The four statements say: all are true, only one is true, exactly two are true, or exactly three are true.

If we try to satisfy all four as true, that would make the claim “only one is true” true as well, which is a contradiction. If we try to have exactly two or exactly three true, the counts would force there to be a different number of true statements than the one those statements assert, creating inconsistencies. The only self-consistent scenario is that exactly one statement is true, and that one is the one claiming that only one statement is correct. Then the others must be false, which aligns with their own content (they’re not all true, not exactly two, not exactly three).

So the reliable conclusion is that exactly one statement is correct, meaning the statement about only one statement being correct is the consistent choice.