This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Medicine
Vitamin K is given to a patient with jaundice, but PT remains unchanged. Probable cause is 
Select and explain. 
A. Obstructive Jaundice, B. Cirrhosis, C. Hemolytic Jaundice, D. Pre-renal Failure
B: Cirrhosis
Answer: B: Cirrhosis 
Explanation: An elevated prothrombin time indicates either vitamin K deficiency due to prolonged jaundice and malabsorption of vitamin K or significant hepatocellular dysfunction. The failure of the prothrombin time to correct with parenteral administration of vitamin K indicates severe hepatocellular injuryReference: Harrison&;s Principles of Internal Medicine; 19th edition; Chapter 58; Jaundice