This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Which of the following is not involved in intrinsic pathway? 
Select and explain. 
A. Factor XII, B. Factor XI, C. Factor IX, D. Factor VII
D: Factor VII
Answer: D: Factor VII 
Explanation: Factor VII is required for the activation of Factor X in extrinsic pathway Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:533