In the following STIs, which one is not completely curable?

$STDs$ (Sexually Transmitted Diseases) can lead to several long-term complications. Which of the following are considered later complications of $STDs$?
$I$. Pelvic inflammatory disease
$II$. Abortion
$III$. Stillbirth
$IV$. Ectopic pregnancies
$V$. Infertility
$VI$. Cancer
Choose the correct combination:

What are the early symptoms of $STDs$?

What measures should be taken to avoid the transmission of $STD$s?
$I$. Avoid sex with unknown partners
$II$. Avoid sex with multiple partners
$III$. Use protection during sex
$IV$. Avoid sharing needles

Venereal diseases (Sexually Transmitted Infections) can spread through:
$(a)$ Using sterile needles
$(b)$ Transfusion of blood from an infected person
$(c)$ Infected mother to foetus
$(d)$ Kissing
$(e)$ Inheritance
Choose the correct answer from the options given below.

Most of the sexually transmitted diseases are completely curable if detected early and treated properly,except: