A21-year-old college student has sought care because of the vaginal burning, itching, and redness that have become worse in recent weeks. which of the clinician's assessment questions is most likely to apply to a diagnosis of vaginitis?

The student who  experienced burning, itching, and redness of vagina may be diagnosed for vaginitis using clinician's assessment questions like a- Have your periods been regular in the last few months?” and c-“Are you using oral contraceptives?”

Vaginitis occurs when there are changes in the vaginal environment that allow pathogens to grow. If the student answered NO to a. she must be pregnant.  If she answered YES to c., then she is having sexual intercourse. Pregnancy, sexual intercourse and use of contraceptives along with antibiotics, stress, and hormones alter the vaginal flora thus allowing pathogens to proliferate causing vaginitis.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."