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: Pediatrics
[{'content': 'Characteristic lab findings of hemophilia A are –a) ↑ PTb) ↑ aPTTc) X–linked recessived) Presence of 30% of factor level express the diseasee) Increased bleeding time \nSelect and explain. \nA. a, B. c, C. ac, D. bc', 'role': 'user'}, {'content': "Answer: D \nExplanation: Hemophilia A\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\n\nHemophilia A is due to deficiency offactor VIII.\nHemophilia 'A' is inherited as an X-linked recessive trait.\nFactor VIII is an intrinsic pathway component required for activation of factor X.\nClinical manifestations are due to defect in coagulation system -\n\n\nLarge post-traumatic ecchymoses or hematoma\nProlonged bleeding after a laceration or any form of surgical procedure.\nBleeding into weight bearing joints.\n\n\n\nPetechiae are characteristically absent (in contrast to platelet dysfunction where bleeding occurs from small vessels of the skin and mucous membrane, e.g. petechiae).\n\nLaboratory findings\n\nPIT\xa0\xa0\nNormal PT\xa0\nNormal BT\xa0\xa0\xa0\xa0\xa0\nNormal platelet counts\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\n\nRemember\n\nHemophilia B (Christmas disease) is due to deficiency of factor IX\nHemophilia B has clinical features and laboratory findings similar to haemophilia A.", 'role': 'assistant'}]