<prompt> 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?UltrasoundHIDA scanLiver function testsCT abdomen  <response>: Ans. b. HIDA scan 