This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Clotting system, Subject name: Pathology
Which of the coagulation factor is least affected in a patient with vitamin K deficiency? 
Select and explain. 
A. Factor 10, B. Factor 9, C. Factor 8, D. Factor2
C: Factor 8
Answer: C: Factor 8 
Explanation: Factor VIII Patient with vitamin K deficiency will have mostly involvement of dependent clotting factors. I.e. Factors II, VII, IX & X