Answer: TEMPERAMENT
Explanation: TEMPERAMENT is a constant difference in behavior of an individual that is connected biologically ( it can be as a result of inheritance). Temperament does not have any direct connection with environment,values or attitudes.
Temperament shows up in an individual's way of reacting to emotions, behaviors or certain conditions or actions. A physician known as GALEN,tried to classify temperament according to 4 humors or body fluid as melancholic, phlegmatic, sanguine and choleric based upon the four humours or bodily fluids.