This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
Increased PT and Normal PTT are found in? - 
Select and explain. 
A. Von Willibrand's disease, B. Factor 7 deficiency, C. Factor 8 deficiency, D. Thrombin deficiency
B: Factor 7 deficiency
Answer: B: Factor 7 deficiency 
Explanation: Answer is option 2, factor seven deficiency The investigations revealed normal platelet counts, deranged prothrombin time (PT) with International normalised ratio (INR) of 6.2. Activated paial thromboplastin time (aPTT) was within normal limits. Ref Robbins 9/e pg 449