Alexander Fleming discovered
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Penicillin
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X-ray
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Streptomycin
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Telephone
A
Correct answer
Explanation
Alexander Fleming discovered penicillin in 1928 from the Penicillium mold, revolutionizing medicine with the first antibiotic. X-rays were discovered by Wilhelm Röntgen, streptomycin by Selman Waksman, and the telephone by Alexander Graham Bell.