This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Physiology, Subject name: Physiology
[{'content': 'A patient has a congenital deficiency in factor XIII (fibrin-stabilizing factor). What would analysis of his blood reveal? \nSelect and explain. \nA. Prolonged prothrombin time, B. Prolonged whole blood clotting time, C. Prolonged paial thromboplastin time, D. Easily breakable clot', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fibrin monomers polymerize to form a clot. Creation of a strong clot requires the presence of fibrin stabilizing factor that is released from platelets within the clot. The other clotting tests determine the activation of extrinsic and intrinsic pathways or number of platelets.', 'role': 'assistant'}]