What could be the possible harm of using an antibiotic-resistant gene as a selectable marker in a plasmid,used for gene transfer in the production of $GM$ food?
$(A)$ $GM$ food contains the enzyme produced by the antibiotic resistance gene that was used during gene transfer in genetic engineering. This could cause allergies since it is a foreign protein.
$(B)$ The bacteria present in the alimentary canal of humans could take up the antibiotic resistance gene present in $GM$ food.
$(C)$ The bacteria in the human alimentary canal would then become resistant to the concerned antibiotic.
$(D)$ The transgene may be transferred through pollen to their wild relatives and make weeds more persistent and damaging.

• A
  $(A)$ only
• B
  Both $(B)$ and $(C)$
• C
  $(A), (B)$ and $(C)$
• D
  $(A), (B), (C)$ and $(D)$