Its for my health class can someone HELP me with this idk what to put

According to icd-10 official guidelines for coding and reporting section i.c.13.d. osteoporosis is a systematic condition, meaning that all bones of the musculoskeletal system are affected. therefore, site is not a component of the codes and you should use codes under which category?

When a person undergoes root canal treatment or another endodontic treatment: [select all that apply] a.) the inside of the tooth is carefully cleaned and disinfected. b.) air is forced into the canal to stop bleeding. c.) the inflamed/infected pulp is removed. d.) the inside of the tooth is filled and sealed with a rubber-like material called gutta-percha

How could you find out if that advice is based in scientific evidence?