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: Surgery
[{'content': 'Tissue suturing glue contains: \nSelect and explain. \nA. Cyanoacrylate, B. Ethanolamine oleate, C. Methacrylate, D. Polychloroprene', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most tissue adhesives or glue are cyanoacrylate polymers, such as n-butyl-2-cyanoacrylate (eg, Histoacryl®, PeriAcryl®) or 2-octyl cyanoacrylate (eg, Dermabond®, Surgiseal).\nCyanoacrylate tissue adhesives are liquid monomers that undergo an exothermic reaction on exposure to moisture (eg, on the skin surface), changing to polymers that form a strong tissue bond. When applied to a laceration, the polymer binds the wound edges together to allow normal healing of the underlying tissue.\nCompared with wounds closed with sutures, the tensile strength of wounds closed by tissue adhesives is less at the time of initial application, but equalizes by one week post-repair.\nAdvantages:\n\nLess painful application, and sometimes no need for local anesthetic injection\nMore rapid application and repair time\nCosmetically similar results at 12 months post-repair\n\tWaterproof barrier\nAntimicrobial properties\nBetter acceptance by patients\nNo need for suture removal or follow-up\n\nIndications and contraindications:\n\n\nFor use of tissue adhesives the wound needs to be clean, dry with near perfect hemostasis and under no tension.\nComplex stellate lesions or crush injuries should not be closed with tissue adhesives since good wound approximation is difficult to achieve.\nTissue adhesives are not recommended for lacerations of the hands, feet, or joints, since repetitive movements could cause the adhesive bond to break before sufficient tensile strength is achieved.\nTissue adhesives are not recommended for the oral mucosa or other mucosal surfaces or areas of high moisture such as the axillae and perineum.\nLacerations involving the hairline or vermilion border require more precision, and should be repaired with traditional sutures.', 'role': 'assistant'}]