患者男，64岁，已婚。急性胆囊炎住院3d，抗生素治疗3d，体温正常，血常规正常。但近几天晚上不睡觉，常常在床底下找东西，一会讲有老鼠，一会讲有小猫，使病房不得安宁。讲话颠三倒四，护士给其打针时显得紧张、害怕，有时拔掉补液针头，不配合治疗，称护士要害他，要出院。有时不认识家人。白天睡觉，晚上兴奋、话多、吵闹，影响他人休息。对晚上吵闹记不清楚，常常否认。

患者最可能的诊断是（）

A.老年痴呆

B.谵妄

C.精神分裂症

D.类躁狂发作

E.焦虑障碍

— How did you go home after the party last night?

— Well, there were no buses________we had to walk. [ ]

A. so as to  

B. in order to

C. so that  

D. in order that