问题：
[单选题]男性，60岁。近1个月常于劳累后感心前区疼痛，呼吸困难，伴窒息感，疼痛与深呼吸无关。最有可能的病因是（）
A、A.慢性支气管炎并发肺气肿
B、胸膜炎
C、心包积液
D、心绞痛
E、肺结核
参考答案：
D
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