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【单选题】
化学与生活、社会密切相关。下列说法正确的是A.
光导纤维导电能力很强，是一种很好的通讯材料
B.
凡含有食品添加剂的食物对人体健康均有害，不可食用
C.
苯酚有一定毒性，能做消毒剂和防腐剂
D.
棉、麻、丝、合成纤维完全燃烧都只生成二氧化碳和水
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