This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Social science, Mental health & Genetics, Subject name: Social & Preventive Medicine
Which one of the following is an environmental factor associated with mental illness? 
Select and explain. 
A. Emotional stress, B. Frustration, C. Broken home, D. all of the above
D: all of the above
Answer: D: all of the above 
Explanation: the social and environmental factors associated with mental health comprises of worries, anxieties, emotional stress , broken homes , frustration, ,tension,unhappy, marriages, povey, industrialization environmental factors other than psychosocial ones capable of producing abnormal human behaviour are toxic substances (carboun disulfide), psychotropic drugs are barbiturates, thiamine deficiency, measles and rubella infection, radiation ref ;(page no;832)23rd edition of PARK&;s textbook of Preventive and Social medicine