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
A child underwent a tonsillectomy at 6 years of age with no complications. He underwent a preoperative screening for bleeding at the age of 12 years before an elective laparotomy, and was found to have a prolonged partial thromboplastin time, but normal prothrombin time. There was no family history of bleeding. The patient is likely to have acquired Vitamin K deficiency: 
Select and explain. 
A. Acquired Vitamin K deficiency, B. Acquired liver disease, C. Factor XII deficiency, D. Mild hemophilia A
C: Factor XII deficiency
Answer: C: Factor XII deficiency 
Explanation: None