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An adult casualty isn't breathing. To maintain circulation, CPR should be given. What's the correct depth to press down on their chest?

A 5 to 6 centimetres
An adult casualty isn't breathing normally. To maintain circulation, place two hands on the centre of the chest. Then press down hard and fast – around 5–6 centimetres and about twice a second.
B 1 to 2 centimetres
C 10 to 15 centimetres
D 15 to 20 centimetres