Which of the Following Statements is TRUE

Question

Which of the following statements is TRUE?
A)A person without signs of illness may be infectious.
B)The normal microbiota of the body can cause infections.
C)Zoonotic organisms may infect humans and animals.
D)Parasitic diseases may have more than one host.
E)All of the above.

Accepted Answer

A) A person without signs of illness may still be a carrier of a pathogen and capable of spreading the infection to others. 
B) Normal microbiota can become opportunistic pathogens and cause infections in some situations. 
C) Zoonotic diseases are caused by pathogens that can be spread between animals and humans. 
D) Many parasitic diseases require multiple hosts to complete their life cycle. Therefore, all of the above statements are true.