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: Biochemistry
Vit-K deficiency is indicated by: 
Select and explain. 
A. Low platelet count, B. Increased prothrombin time, C. Decreased prothrombin time, D. None of the above
B: Increased prothrombin time
Answer: B: Increased prothrombin time 
Explanation: None