<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 31-year-old man presents with jaundice, scleral icterus, dark urine, and pruritus. He also says that he has been experiencing abdominal pain shortly after eating. He says that symptoms started a week ago and have not improved. The patient denies any associated fever or recent weight-loss. He is afebrile and vital signs are within normal limits. On physical examination, the patients skin appears yellowish. Scleral icterus is present. Remainder of physical examination is unremarkable. Laboratory findings are significant for:Conjugated bilirubin 5.1 mgdLTotal bilirubin 6.0 mgdLAST 24 ULALT 22 ULAlkaline phosphatase 662 ULA contrast CT of the abdomen is unremarkable. An ultrasound of the right upper quadrant reveals a normal gallbladder, but the common bile duct is not visible. Which of the following is the next best step in the management of this patient?? A: Antibiotics and admit to observation, B: HIDA scan, C: Endoscopic retrograde cholangiopancreatography ERCP, D: Serologies for antimitochondrial antibodies, E: Hepatitis serologies,  <response>: This is a clinical vignette describing a 31-year-old man with jaundice, scleral icterus, dark urine, pruritus, and postprandial abdominal pain. Key findings include conjugated hyperbilirubinemia with minimally elevated transaminases and markedly elevated alkaline phosphatase. Imaging shows a non-dilated biliary system but the common bile duct is not visualized on ultrasound. This presentation is most consistent with extrahepatic cholestasis, likely from choledocholithiasis gallstone obstructing the common bile duct. The next step would be to directly visualize the biliary system, which is best accomplished with ERCP. Antibiotics and admission for observation may be indicated later but will not diagnose the underlying problem. HIDA scan assesses gallbladder ejection fraction but does not visualize the biliary tree. Serologies and hepatitis testing are not indicated based on the clinical presentation.C: Endoscopic retrograde cholangiopancreatography ERCP 