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: Forensic Medicine
For diagnosis of lunacy a person can be kept under observation at a streach for : 
Select and explain. 
A. 2 Days, B. 7 Days, C. 10 Days, D. 30 Days
C: 10 Days
Answer: C: 10 Days 
Explanation: C i.e. 10 days