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
Presenile dementia is defined as that which occur below the age of ....... years : 
Select and explain. 
A. 50, B. 55, C. 60, D. 65
C: 60
Answer: C: 60 
Explanation: C i.e. 60