They are transmitted through having sex
Answer - A. Depressants
Reasoning - Why his Lungs, Kidney, Liver are failing is because of depressants. When taking depressants and overdosing like cough syrup can cause the organs go into a state of depressant. Which causes the organs to have problems and can kill him.
Her risk of scarring of her fallopian (uterine) tube(s) is increased with untreated Chlamydial infection. This untreated infection can lead to pelvic inflammatory disease (PID), which can scar the tubes, possibly causing infertility.
I think the answer would be no