Which of the following set represents communicable diseases?

Communicable diseases are those that spread from one person to another through pathogens. Typhoid (bacterial), swine flu (viral), malaria (parasitic, via mosquito), and polio (viral) are all communicable diseases. Anaemia is a deficiency disease (iron deficiency), scurvy is a vitamin C deficiency disease, and diabetes is a metabolic non-communicable disease. Hence option (3) is correct.