This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Liver, Subject name: Medicine
A 40 year old lady has ALP of 550, SGOT of 75, total serum Bilirubin = 6.5mg% and conjugated serum bilirubin of 4.3mg%. The diagnosis of patient is: 
Select and explain. 
A. Dubin Johnson syndrome, B. Obstructive jaundice, C. Viral hepatitis, D. Cholelithiasis
B: Obstructive jaundice
Answer: B: Obstructive jaundice 
Explanation: Marker Normal value Interpretation Alkaline phosphatase 20-140 IU/L ELEVATED SGOT 5-40 units per liter Mild elevation Total serum bilirubin 0.3-1.2mg/dl Elevated Conjugated serum bilirubin 0.1-0.4mg/dl Elevated If only serum bilirubin is elevated and conjugated serum bilirubin is > 15% of total bilirubin then suspect Dubin Johnson and Rotor's syndrome If ALP is elevated with serum bilirubin proceed to USG to evaluate for cause of obstructive jaundice.