The terrorist sent an ___________ letter to the government threatening another suicide bombing in the city. A: anonymous B: opportunistic C: precaution D: commonplace

Reactions<br/>to penicillin and immunizing agents is ( ) A: opportunistic<br/>disease B: nosocomial<br/>infection C: Iatrogenic<br/>disease D: none<br/>of the above

() are free-living organisms that are capable of becoming parasitic<br/>if placed in a situation conductive to such a mode. A: opportunistic parasite B: Obligatove parasites C: Endoparasite D: Facultative parasites

The diagnosis of HIV / AIDS includes A: Diagnosis of HIV / AIDS infection (antibody confirmatory test and HIV-RNA test) B: Diagnosis of opportunistic infection and tumor C: Diagnosis of immune function D: All of the above