Which of the following molecules contain a sulphur atom in their structures?
$I$. Morphine
$II$. Heroin
$III$. Penicillin
$IV$. Terpineol
$V$. Cimetidine

• A
  $I, IV$
• B
  $II, III$
• C
  $III, V$
• D
  $IV, V$