Which one of the following statements is NOT the nosocomial infection?
A.
Doctors acquired the infection of a pathogen when they treated the patients in the hospital;
B.
A farmer was infected with H5N1 influenza A virus when he worked with the poultry in a farm;
C.
A farmer caught a cold when he visited a friend treated in a hospital;
D.
A farmer was transfused with blood cotaminated with HIV after bleeding much in an accident;