People say I put doctors out of business, sometimes I am sour, sometimes I am sweet, I can be eaten and can also be drunk. What am I?

Answer: An apple

More What am I ? with answers

More What am I ?

People walk in and out of me. They push and I follow. When they walk out on me, I close up and I stay waiting for the next person to walk into my life when I have a more open mind. What am I?
Physicists have built devices to make me move quickly. My last eight letters can be commonly found in newspapers, magazines, and journals. What am I?
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Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, my greedy lust devours them all. What am I?
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Round and round, never off the ground. What am I?
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Rub me and a genie might appear. What am I?
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Say my name and I disappear. What am I?
Score in end zones. What am I?