Is your child vaccinated
The pattern
This still is filed under Question headline.
Define
The first line is a question the reader was already asking, or one they cannot leave unanswered.
Mechanism
Open loop plus recognition. A good question is the reader's objection, spoken first by us.
Verdict
We know the real objection and can answer it in the next breath.
Why it works
One oversized punctuation mark serves as both illustration and grammar, which is how the sheet holds a full composition with no drawing budget. The interrogative form makes the reader run a check on themselves rather than receive an order, and an unresolved answer is the tension the poster is built to create. Sequencing matters: the remedy word appears before the disease word, so the last thing read is the threat and the thing already in mind is the fix.
Steal this when
Copy this when the barrier is inattention rather than objection, and you want the reader to audit themselves. Also copy the device of building the whole layout from a single piece of oversized punctuation when illustration is out of reach.