Which of the following is NOT correct Which of the following

Which of the following is NOT correct?

-Protozoans are fairly susceptible to antimicrobial controls, but their cysts are resistant.

-Naked viruses are more susceptible to antimicrobial control agents than are enveloped viruses.

-The antimicrobial effect of heat is enhanced by acidic conditions.

-Warm disinfectants generally work better than cool ones.

The answer is -Naked viruses are more susceptible to antimicrobial control agents than are enveloped viruses.