A check run after the correction only measures who was listening to the correction. Put the question up cold, let the wrong answers sit on screen, then teach into them — the room now has a stake in which one was right.
If sixty per cent pick the misconception and you carry on to the next slide anyway, the students learn that the question was theatre. Say out loud what the result changed: another example, a slower pass, a topic moved to next week.
In a hall of three hundred the count climbs fast and then flattens. Closing on the plateau takes about forty seconds and does not punish the person still reading the fourth option; closing on a fixed timer does both jobs badly.
Put it on the title slide and again in a corner of the running deck. People arrive late, phones lock, and someone in row twenty decides at minute thirty that they do want to answer after all.
The moment answers can be traced they become performances, and the confident students answer twice as often as the confused ones. Anonymity is not a nicety here; it is the only reason the numbers mean anything.
Take the top two from the open question at the break and answer them without comment on who asked. A hall that hears a hesitant question treated seriously sends more of them next week.