I think this a tough question, and I hesitated between a) and b), but I choose the second answer - Physical Therapist.
Physical Therapists are licensed providers of care, and their educational education has evolved to the point where physical therapists graduate with a doctorate in physcal therapy. Personal trainers have a degree or a certificate. This is not the same.
One of the easiest ways to know understanding about sexually transmitted disease is asking which form of birth control does the person uses. Using a condom is the best way to prevent nasty gonorrhea and more serious ones like herpes and HIV. However, condom alone is not effective. Many sexually transmitted infections can still be transmitted even if partners use condoms or other barrier devices. In the question, Jennie must know if her partner is having sex with others. If her partner does have other sex partners, Jennie is still facing higher risk of contracting infection.
Sinew connects muscle to bone
and includes ligaments and tendons