The correct option is A Transfer of pathogens through hand towel, Communicable disease.
∙ The type of diseases which spread from infected people to healthy ones are known as “communicable diseases”.
∙ They get spread through air, water, food or through physical contact of an infected person (or theough his/her used towels, kerchiefs) or through insects like houseflies and mosquitoes.
∙ Common cold, conjunctivitis, typhoid, smallpox, chickenpox, swine flu, tuberculosis are some of the communicable diseases.
∙ Some insects and animals carry diseases causing microorganisms. They are called as ‘vectors’.
∙ When an infected person sneezes or coughs, the pathogens enters into air from such infected persons. When this air containing pathogens enter into the body of healthy person and may cause cold.