<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 29-year-old woman, gravida 1, para 0 at 11 weeks gestation comes to the physician because of a 2-day history of left lower extremity pain and swelling. Her temperature is 37.9C 100.2F. Physical examination shows a tender, palpable cord on the lateral aspect of the left lower leg. The overlying skin is erythematous and indurated. Duplex ultrasound shows vascular wall thickening and subcutaneous edema. Which of the following is the most likely diagnosis?? A: Deep vein thrombosis, B: Erysipelas, C: Erythema nodosum, D: Varicose vein, E: Superficial thrombophlebitis,  <response>: This is a clinical vignette describing a 29-year-old pregnant woman with a 2-day history of left lower extremity pain and swelling. She has a fever of 37.9C. On exam she has a tender, palpable cord on the lateral aspect of her left lower leg with overlying erythematous and indurated skin. Duplex ultrasound shows vascular wall thickening and subcutaneous edema. The key findings here are a painful cord-like area in the left lower leg with overlying erythema and induration, along with ultrasound evidence of vascular wall thickening and edema. This localized process involving a superficial vein with surrounding inflammation points towards superficial thrombophlebitis as the most likely diagnosis.Deep vein thrombosis would not present as a palpable cord and is not associated with overlying erythema. Erysipelas and erythema nodosum may cause erythema but not a palpable cord. Varicose veins do not cause acute pain, erythema or induration.E: Superficial thrombophlebitis 