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
Lallu a 22 yrs. old male suffers from decreased sleep, increased sexual activity, excitement and spending excessive money for last 8 days. The diagnosis is- 
Select and explain. 
A. Confusion, B. Mania, C. Hyperactivity, D. Loss of memory
B: Mania
Answer: B: Mania 
Explanation: Decreased sleep, increased sexual activity, excitement and spending excessive money are symptoms of mania.