To solve this problem, we need to identify which option includes only sexually transmitted diseases (STDs). Let's analyze each option:$\newline \bullet$Option 1: Gonorrhoea, Malaria, Genital herpes$\newline$ - Gonorrhoea and Genital herpes are STDs, but Malaria is not.$\newline \bullet$Option 2: AIDS, Malaria, Filaria$\newline$ - AIDS is an STD, but Malaria and Filaria are not.$\newline \bullet$Option 3: Cancer, AIDS, Syphilis$\newline$ - AIDS and Syphilis are STDs, but Cancer is not.$\newline \bullet$Option 4: Gonorrhoea, Syphilis, Genital herpes$\newline$ - All three, Gonorrhoea, Syphilis, and Genital herpes, are STDs.$\newline$Therefore, the correct option that includes all sexually transmitted diseases is Option 4.