This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Which clotting factor is required for stabilization of fibrin clot? \nSelect and explain. \nA. XIIIa, B. VIII, C. IX, D. V', 'role': 'user'}, {'content': "Answer: A \nExplanation: The fibrin is initially a loose mesh of interlacing strands. It is conveed by the formation of covalent cross-linkages to a dense, tight aggregate (stabilization). This latter reaction is catalyzed by activated factor XIII ie XIIIaVIII - Antihemophilic factor (AHF), antihemophilic factor A, antihemophilic globulin (AHG)IX - Plasma thromboplastin component (PTC), Christmas factor, antihemophilic factor BV - Proaccelerin, labile factor, accelerator globulinRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:532", 'role': 'assistant'}]