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
PT is used to test ? 
Select and explain. 
A. Extrinsic and common pathway, B. Intrinsic and common pathway, C. Intrinsic pathway, D. Extrinsic pathwa
A: Extrinsic and common pathway
Answer: A: Extrinsic and common pathway 
Explanation: Ans. is 'a' i.e., Extrinsic and common pathway Patients with hemophilia have deficiency of factor VIII that results in prolonged PTT.