Examination methods of gallbladder and bile ducts in case of mechanical jaundice are all, except:
A. Endoscopic retrograde cholangiography
B. Ultrasonoscopy
C. Transcutane transhepatic cholangiography
D. Plain x-ray
E. Intravenous cholecystocholangiography
Answer: E. Intravenous cholecystocholangiography