Consider the following statements:1.Biofilms can form on medical implants within human tissues.2.Biofilms can form on food and food processing surfaces.3.Biofilms can exhibit antibiotic resistance.Which of the statements given above are correct?

1. A

   1 and 2 only

   1 and 2 only. Antibiotic tolerance/resistance of biofilms is also true.

2. B

   2 and 3 only

   2 and 3 only. Implants grow biofilms too.

3. C

   1 and 3 only

   1 and 3 only. Food-contact surfaces are a standard biofilm site.

4. D

   1, 2 and 3

   All three. Implants, food plant surfaces, and hard-to-treat biofilm resistance.

Summary. Official key is (d) all three. Biofilms colonise implants and food-processing surfaces and are markedly less susceptible to antibiotics than planktonic cells.