Consider the following statements

$I.$ Antibiotics are chemical substances produced by some microorganisms which can kill or retard the growth of other disease-causing microorganisms

$II.$ Penicillin is the first antibiotic discovered by Alexander Fleming $(1928),$ while working on bacterium Staphylococcusaureus

$III.$ The function of penicillin as an antibiotic was established by Ernst chain and Howard Florey

Which of the statement given above are correct?

• A

  $I$ and $II$

• B

  $I$ and $III$

• C

  $II$ and $III$

• D

  $I, II$ and $III$