This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
A patient of endogenous depression was administered imipramine. After how much time interval the therapeutic effect of Imipramine is likely to manifest? 
Select and explain. 
A. 3 days, B. 1 week, C. 3 weeks, D. 3 months
C: 3 weeks
Answer: C: 3 weeks 
Explanation: .