The correct option is C Gonorrhoea, hepatitis-B, chlamydiasis
Gonorrhoea, hepatitis-B and chlamydiasis are sexually transmitted diseases (STDs). These are transmitted through sexual intercourse with infected persons. Whereas cholera, malaria and haemophilia in other groups are not STDs. Cholera is a bacterial disease, malaria is a protozoan disease and haemophilia is a sex-linked genetic disorder.