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: Medicine
A 50 years old patient presented with progressive jaundice. Liver function test was done in which conju!gated serum bilirubin-4.8% and total bilirubin-6.7%, alkaline phosphatase- 550 IU, SGOT-50, SGPT-65. Most probable diagnosis is; 
Select and explain. 
A. Jaundice due to choledocholithiasis, B. Dubin-Johnson syndrome, C. Viral hepatitis, D. Malignant obstructive jaundice
A: Jaundice due to choledocholithiasis
Answer: A: Jaundice due to choledocholithiasis 
Explanation: Answer- A. Jaundice due to choledocholithiasisThe maximum bilirubin level is seldom >256.5 micromol/L (15.0 mg/dl) in patients wilh choledocholithiasis unless concomitant hepatic disease or anotherfactor leading to marked hyperbilirubinemia exists.'-Harrison I8/e p2625.'Serum bilirubin levels >342.0 micromol/L (20 mg/dL) should suggest the possibility of neoplastic obstruction.'-Harrisonl8/e p2625CholedocholithiasisCBD stones should be suspected in any patient with cholecystitis whose serum bilirubin level is >85.5 micromol/L (5 mg/dL).The maximum bilirubin level is seldom >256.5 micromol/L (15.0 mg/dl) in patients with choledocholithiasis.