单选题：以下哪项对风湿性心脏病主动脉瓣狭窄和先天性主动脉瓣狭窄鉴别诊断有帮助（　　）

题目内容：
以下哪项对风湿性心脏病主动脉瓣狭窄和先天性主动脉瓣狭窄鉴别诊断有帮助（　　） A．20岁前发现胸骨右缘第二肋间有粗糙的收缩期杂音
B．心电图示左室肥厚
C．X线示升主动脉扩张
D．超声心动图示二叶主动脉瓣
E．超声心动图示室间隔肥厚
参考答案：
答案解析：

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