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?
Ans. b. HIDA scan
Ultrasound
HIDA scan
Liver function tests
CT abdomen