Answer: B. Nuclear scintigraphy with iminodiacetic acid (IDA).
IDA administered IV is taken up by hepatocytes and secreted into bile canaliculi. Visualization of the gallbladder and common duct within 1 hour has a negative predictive value of 98%. Scintigraphy with IDA loses its sensitivity at bilirubin levels of 5 to 8 mg/dL.