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দেশজ উপাদান ব্যবহার করে আর্সেনিক মুক্ত করার পদ্ধতির আবিস্কারক কে?

  1. A ড.আম.আজাদ
  2. B ড.ইউনুস
  3. C ড.এম. এ. হাসান
  4. D ড.এম.এ.বাসার
Answer: C - ড.এম. এ. হাসান

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