A 70-year-old man presented to his physician with a broken a…

A 70-year-old man presented to his physician with a broken arm. Laboratory work indicated an elevated prothrombin time (PT), which would indicate that his blood is not clotting properly. The man was also taking an antibiotic for an earlier respiratory infection. Which of the following vitamins might be involved?

A 52-year-old female presents to the clinic with complaints…

A 52-year-old female presents to the clinic with complaints of a amenorrhea for 6 months. She denies pain with urination or with sexual intercourse. She denies using any birth control. She reports some concerns of flushing and increase sweating. Which of the following is the most accurate interpretation of these findings?