<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 35-year-old man comes to the clinic complaining of yellow discoloration of his skin and eyes for the past week. He also complains about loss of appetite, nausea, malaise, and severe tiredness. He has no known past medical history and takes over-the-counter acetaminophen for headache. He has smoked a half pack of cigarettes every day for the last 15 years and drinks alcohol occasionally. He has been sexually active with a new partner for a month and uses condoms inconsistently. His father and mother live in China, and he visited them last year. Temperature is 37C 98.7F, blood pressure is 13090 mm Hg, pulse is 90min, respirations are 12min, and BMI is 25 kgm2. On physical examination, his sclera and skin are icteric. Cardiopulmonary examination is negative, no lymphadenopathy is noted, and his abdomen is tender in the right upper quadrant RUQ. His liver is palpated 3 cm below the costal margin. On laboratory investigations:Laboratory testComplete blood count Hemoglobin 15 gdLLeucocytes 13,000mm3Platelets 170,000mm3Basic metabolic panel Serum Na 133 mEqLSerum K 3.6 mEqLSerum Cl- 107 mEqLSerum HCO3- 26 mEqLBUN 12 mgdLLiver function test Serum bilirubin 3.4 mgdLDirect bilirubin 2.5 mgdLAST 2,100 ULALT 2,435 ULALP 130 ULWhat is the next best step to do in this patient?? A: USG of the abdomen, B: CT scan of the abdomen, C: Reassurance and counselling, D: HbsAg and Anti-IgM Hbc, E: ERCP,  <response>: This is a clinical case of a 35-year-old man presenting with jaundice, loss of appetite, nausea, malaise, severe tiredness, and right upper quadrant abdominal tenderness. Key findings include elevated bilirubin, AST, and ALT indicating liver injury. The differential diagnosis includes viral hepatitis, autoimmune hepatitis, medication-induced liver injury, and biliary obstruction. Based on the history of new sexual partner and elevated transaminases, viral hepatitis is most likely. HBsAg and anti-IgM HBc antibody tests would help confirm acute hepatitis B infection.Imaging like USG or CT abdomen may show liver enlargement or biliary dilation but would not confirm the diagnosis. ERCP is invasive and not indicated yet. Reassurance without a definitive diagnosis would be premature.D: HbsAg and Anti-IgM Hbc 