(N/A) $1$. Sexually Transmitted Diseases $(STDs)$ are infections or diseases which are transmitted through sexual intercourse with an infected person.
$2$. Reproductive Tract Infections $(RTIs)$ are infections that specifically affect the reproductive organs (e.g.,Gonorrhea,Syphilis,Chlamydia).
$3$. While diseases like Gonorrhea and Syphilis are both $STDs$ and $RTIs$ because they affect the reproductive tract,diseases like $AIDS$ (caused by $HIV$) and Hepatitis-$B$ are $STDs$ because they spread through sexual contact,but they are not classified as $RTIs$ because they do not primarily infect the reproductive tract organs.
$4$. Therefore,all $RTIs$ are $STDs$,but all $STDs$ are not $RTIs$.