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
Optimal healthy life includes - 
Select and explain. 
A. Moderate physical exercise, B. Sufficient nutrition, C. Mental peace, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Determinants of health 

Following determinants of health provide good health, optimal health or positive health.

Genetic configuration → Genetic constitution of an individual can affect the health e.g. G-6-PD deficiency.
Level of development → Economic and social development helps to improve health status. 
Life style → Moderate physical activity, cessation of smoking and regular exercise prevent the occurence of CHD. Adequate nutrition, sound mind (mental peace) and enough sleep also promote health.
Environment → Proper sanitation, adequate safe drinking water and low level of atmospheric pollution promote health.
Health infrastructure → If primary health care facilities are available in the vicinity and such facilities are utilized by population, the health of individuals and communities is bound to improve.