Question: A 45-year-old female patient with a history of hypothyroidism presents with a complaint of recurrent episodes of symmetric color change in her hands and feet. She relates that her hands become blue, white, or red from time to time, with associated numbness and tingling. She has also noticed that her hands become extremely numb when exposed to cold temperatures. Which of the following is a risk factor for her condition? A. Smoking B. IV drug use C. Hypertension D. Hyperlipidemia