51. 牙周病感染可能會導致的全身性疾病有？ ①細菌性心內膜炎(Bacterial endocarditis)②細菌性肺炎 (Bacterial pneumonia) ③ 孕期不適 (pregnancy disorder) ④ 注意力不足過動症 (Attention deficit hyperactivity disorder) (A)①② (B)①②③ (C)①③ (D)①②③④