True but irrelevant: correct, and no help at all

This answer is accurate. You can verify it against the passage, you cannot argue with it, and it is wrong — because being true was never the requirement. The question asked for something specific, and truth alone does not satisfy it.

It is uniquely hard to eliminate for that reason. Most wrong answers can be faulted; this one cannot. It survives the check students actually run — "is this supported?" — and fails only the check they often skip, which is "does this do the job?"

Ask what the question wanted

Each type has a job. Strengthen wants support for THIS conclusion. Main Point wants the claim everything else backs. Role wants a function. A true statement that does none of those is a true statement, not an answer.

So the second question after "is it true" has to be "and does it do what was asked". On a Strengthen question that means asking whether the argument is now in better shape than it was — not whether the sentence is agreeable.

Its favorite homes

• Strengthen and Weaken — a true fact about the topic that leaves the gap between evidence and conclusion untouched.
• Main Point — a premise from the passage. Verbatim true, and doing support work rather than receiving it.
• Role of a Statement — an accurate description of a different sentence than the one quoted.
• RC Inference — something the passage genuinely said, offered where an inference was requested. True is disqualifying there, because nothing was inferred.
• Evaluate — a question whose answer is knowable and changes nothing either way.

The through-line: in every case the answer passed a verification check and failed a purpose check. Building the habit of asking both — in that order, deliberately — is what removes this family.