<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:One week after undergoing sigmoidectomy with end colostomy for complicated diverticulitis, a 67-year-old man has upper abdominal pain. During the surgery, he was transfused two units of packed red blood cells. His postoperative course was uncomplicated. Two days ago, he developed fever. He is currently receiving parenteral nutrition through a central venous catheter. He has type 2 diabetes mellitus, hypertension, and hypercholesterolemia. He is oriented to person, but not to place and time. Prior to admission, his medications included metformin, valsartan, aspirin, and atorvastatin. His temperature is 38.9C 102.0F, pulse is 120min, and blood pressure is 10060 mmHg. Examination shows jaundice of the conjunctivae. Abdominal examination shows tenderness to palpation in the right upper quadrant. There is no rebound tenderness or guarding; bowel sounds are hypoactive. Laboratory studies show:Leukocytes 13,500 mm3Segmented neutrophils 75 SerumAspartate aminotransferase 140 IULAlanine aminotransferase 85 IULAlkaline phosphatase 150 IULBilirubinTotal 2.1 mgdLDirect 1.3 mgdLAmylase 20 IULWhich of the following is the most likely diagnosis in this patient?? A: Acalculous cholecystitis, B: Small bowel obstruction, C: Anastomotic insufficiency, D: Acute pancreatitis, E: Hemolytic transfusion reaction,  <response>: This is a patient who recently underwent sigmoidectomy and now presents with fever, altered mental status, jaundice, and right upper quadrant abdominal pain. The key findings are:- Recent major abdominal surgery - Fever- Jaundice- Elevated liver enzymes- Normal amylaseThe jaundice and elevated liver enzymes point towards a hepatobiliary process as the cause of his symptoms. The normal amylase makes pancreatitis unlikely. His recent surgery and blood transfusion raise concern for infection or transfusion reaction. However, the lack of peritoneal signs makes anastomotic leak less likely. The leading possibilities are therefore acalculous cholecystitis versus transfusion reaction. Of these, acalculous cholecystitis is more likely given the clinical picture.A: Acalculous cholecystitis 