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: Social & Preventive Medicine
The incidence of mental illness is the maximum if the causal factors affect a particular period – 
Select and explain. 
A. Perinatal period, B. First five years of life, C. School age, D. Adolescence
B: First five years of life
Answer: B: First five years of life 
Explanation: The root of mental health are in early childhood (first 5 years of life) - Park
Other crucial period for mental illness : -


Pregnancy (Prenatal period)
School age
Adolescence
Old age