Incorrect!

There's been a collision. A motorcyclist is lying injured and unconscious. Why should you only remove their helmet if it's essential?

They might not want you to remove it
Removing it could make any injuries worse
Correct answer
Removing it could let them get cold
You could scratch the helmet as you remove it
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DVSA theory test explanation

When someone is injured, any movement that's not absolutely necessary should be avoided, since it could make the injuries worse. Unless it's essential to remove a motorcyclist's helmet, it's generally safer to leave it in place.