The main reason why antibiotics could not always treat the bacteria-mediated diseases is

Options

A. Insensitivity of the individual following prolonged exposure to antibiotics
B. Inactivation of antibiotics by bacterial enzymes
C. Decreased efficiency of the immune system
D. The development of mutant strains resistant to antibiotics

Answer

D

Explanation

Some bacteria are naturally resistant to certain types of antibiotics. However, bacteria may also become resistant by genetic mutation or by acquiring resistance from another bacteria.