Amoebiasis is a parasitic infection of the intestines caused by the protozoan Entamoeba histolytica. It can be prevented by using clean, hygienic, sterilized food and water.
Diphtheria is an infection caused by the bacterium Corynebacterium diphtheriae. DPT vaccine prevents against diphtheria, pertussis (whooping cough) and tetanus.
Cholera is an infection of the small intestine by some strains of the bacterium Vibrio cholerae. Oral rehydration therapy (ORT) is a type of fluid replacement used to prevent or treat dehydration caused because of cholera.
Syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum. Therefore correct match is A-2, B-3, C-4 and D-1.