This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'A 3-month-old child with history of passage of clay colored stools and dark yellow urine since one month was given steroids and ursodeoxycholic acid. On fuher investigation, he was found to have direct bilirubin of 6 mg%. Which of the following is the most sensitive investigation for the diagnosis of above-mentioned condition? \nSelect and explain. \nA. Ultrasound, B. HIDA scan, C. Liver function tests, D. CT abdomen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. HIDA scan', 'role': 'assistant'}]