একজন ডাক্তার তার রোগীকে ৫টি ওষুধ দিয়ে ৩০ মিনিট পর পর ১টি করে ওষুধ খেতে বললেন। রোগীটি কত ঘণ্টায় ওষুধগুলো খেতে পারবে?
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D.
Explanation:

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