An apple = any kind of apple — a red delicious, a pippin, a granny smith, a golden delicious, a rome, gala, etc. etc. — or one apple.
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JigneshbharatiAn apple a day keeps the doctor away.An apple every eight hours keeps three doctors away.
JigneshbharatiThanks so here the doctor means specific doctor - your doctor not any other doctor.Not necessarily. We often think of 'the doctor' as an institution rather than a person in British English. If I feel unwell, I am as likely to say 'I must go to the doctor' as 'I must go to a doctor', even if I have no idea which doctor I will go to,