Which of the following scientists established penicillin as an effective antibiotic?
$(i)$ Ernst Chain
$(ii)$ Alexander Fleming
$(iii)$ Howard Florey
$(iv)$ Waksman
$(i)$ Ernst Chain
$(ii)$ Alexander Fleming
$(iii)$ Howard Florey
$(iv)$ Waksman
- A$(i), (ii), (iii)$
- B$(i), (ii)$
- C$(ii)$
- D$(i), (ii), (iii), (iv)$
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