结核病最重要的传染源是
A．原发性肺结核患者
B．血行播散型肺结核患者
C．干酪性肺结核患者
D．慢性纤维空洞性肺结核患者
E．浸润性肺结核患者
参考答案：D
解析：慢性纤维空洞性肺结核是肺结核的晚期类型，多系浸润肺结核发展恶化的结果。病程长，病情的好转与恶化，空洞的形成与纤维修补交替出现，病灶广泛纤维化。此类病人经常大量排菌，为社会的重要传染源。
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