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: Medicine
Which of the following is increased in hemophilia A: 
Select and explain. 
A. PT, B. aPTT, C. PT and aPTT, D. None
B: aPTT
Answer: B: aPTT 
Explanation: An isolated abnormal prothrombin time (PT) suggests Factor VII deficiency, whereas a prolonged activated partial thromboplastin time (aPTT) indicates most commonly hemophilia or Factor XI deficiency.