Which of the following is not a possible consequence of exposure to ozone?
a. chest pain
b. congestion
c. respiratory disease
d. gastroenteritis

Answer D is correct - gastroenteritis is not a possible consequence of exposure to ozone. In fact, ozone is used as an oxidant and disinfectant for surface and groundwater, and has been proved to destroy such diseases as the Norovirus.

Ithink it's choice d (antibiotic resistance)