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: Pathology
A 13 years old female attends hematology clinic for follow-up of a coagulation defect in extrinsic pathway. The coagulation factor that is defective is 
Select and explain. 
A. VII, B. VIII, C. IX, D. XI
A: VII
Answer: A: VII 
Explanation: . VII