<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 24-year-old woman with a past medical history of anorexia nervosa presents to the clinic due to heavy menses, bleeding gums, and easy bruisability. She says she is trying to lose weight by restricting her food intake. She has taken multiple courses of antibiotics for recurrent sinusitis over the past month. No other past medical history or current medications. She is not sexually active. Her vital signs are as follows: temperature 37.0C 98.6F, blood pressure 9060 mm Hg, heart rate 100min, respiratory rate 16min. Her BMI is 16 kgm2. Her physical examination is significant for ecchymosis on the extremities, dry mucous membranes, and bleeding gums. A gynecological exam is non-contributory. Laboratory tests show a prolonged PT, normal PTT, and normal bleeding time. CBC shows microcytic anemia, normal platelets, and normal WBC. Her urine pregnancy test is negative. Which of the following is the most likely cause of her condition?? A: Vitamin K deficiency, B: Acute myelogenous leukemia, C: Missed miscarriage, D: Immune thrombocytopenic purpura, E: Physical abuse,  <response>: This is a question about a 24-year-old woman with a history of anorexia nervosa who is presenting with heavy menses, bleeding gums, easy bruisability, and prolonged PT. The key findings are a history of restricted food intake, recurrent sinusitis and antibiotic use, low BMI, ecchymosis, bleeding gums, microcytic anemia, and prolonged PT with normal platelets. The prolonged PT with normal platelets rules out immune thrombocytopenic purpura. There are no findings suggestive of acute leukemia like high WBC count or blasts. A missed miscarriage would not explain the bleeding findings. Physical abuse may cause bruising but does not explain the other findings. Vitamin K deficiency is the most likely diagnosis given her restricted nutritional intake and antibiotics decreasing vitamin K producing gut flora. This explains the prolonged PT and bleeding findings.A: Vitamin K deficiency 