Doctor

Doctor: is dawaa ko ek hafte main poora karo aur baad main aake milo.
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Patient: teek hai doctor

(ek hafte ke baad)
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Doctor: dawaa khatam huaa kya?
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Patient: nahi doctor.
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Doctor: kyu nahi?
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Patient: usme likhaa thaa ke, bottle ko hamesha bandh rakhe...