Guess who?

I wear a white coat. Sometimes I give you shots to make you feel better. Some people use the phrase "An apple a day keeps _____ away?" to describe me. Who am I?

I have a very dangerous job but it's my job to keep people safe. I wear special clothes to protect me. I use a hose to put out flames. Who am I?

I am always on duty to keep you safe. I wear a uniform and have a badge. I catch thieves. Who am I?

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