Which of the following organisms would MOST likely be sensitive to natural penicillin?

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Streptococcus pyogenes is a Gram-positive bacteria that is known to be sensitive to natural penicillin. Penicillium is a fungi that naturally produces penicillin, so it would not be affected by the antibiotic. Penicillinase-producing Neisseria gonorrhoeae and Mycoplasma are both bacteria that are resistant to natural penicillin. Helminths are not bacteria and therefore are not affected by antibiotics.

Which of the Following Organisms Would MOST Likely Be Sensitive