Chlamydia is very common and can go unnoticed for months or even years. if left untreated it can cause infertility, pelvic inflammation,discharge.
The best and most correct answer among the choices provided by the question is the fourth choice "this is an example of causation"
Causation<span> is the "causal relationship between conduct and result". That is to say that</span>causation<span> provides a means of connecting conduct with a resulting effect, typically an injury.</span>
I hope my answer has come to your help. God bless and have a nice day ahead!