Menstruation is a natural process justify​

Menstruation is the process in which the uterus sheds blood and tissue through the vagina. This is a natural and healthy process for girls and women of reproductive age. In Western communities, this is often called “the period.” It typically lasts 2 to 5 days, but this varies by individual.

i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.