21q: preservative added in DPT vaccine is ?
a. political science
b. anthropology
c. sociology
d. psychology
23q: cyclodevelopmental stage is seen in ?
a. malaria
b. filaria
c. plague
d. cholera
24q: carriers are important source of infection in all except ?
a. measles
b. mumps
c. diphtheria
d. typhoid
25q: food poisoning is caused by ?
a. salmonella paratyphi
b. clostridium perfringes
c. vibrio cholera
d. pneumococcus
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