This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
A 60 year old male comes to casuality with acute retention of urine since 12 hours. On examination there was distended bladder. His son gives a history of taking some drug by the patient. Since 2 days as he is suffering from depression. The most likely drug is - 
Select and explain. 
A. CPZ, B. Amitriptyline, C. Haloperidol, D. Pimozide
B: Amitriptyline
Answer: B: Amitriptyline 
Explanation: Amitriptyline can cause urinary retention due to anticholinergic action.