The correct option is B Both A and R are true and R does not explain A
According to WHO, health is defined as a state of good physical, mental and social well-being. This is a state of the human body where an individual is able to do productive work with ease. Physical well-being refers to a state of being free from illness or injury, which is gained when the homeostasis in humans is maintained. Homeostasis is a characteristic of a living organism that regulates its internal environment and tends to maintain a stable, relatively constant condition. Hence, physical and mental states of health are dependent on homeostasis in the body. Social well-being depends on our social interaction.