According to the psychoanalytic theory, the structure of personality that operates on the reality principle is the

The Ego

Explanation: Freud organised the personality structure into three major components: the id, ego and superego.

The ego is that structure of personality that experiences the reality of the external world, adapts to it and respond to it. It seeks to use the influence if the reality of the external world to bring down the impulsive nature of the id structure. The ego acts like a mediator between the id, external environment and the superego to maintain harmony within the individual.

The ego is also called the reality self or the reality principle and starts to develop between the ages of 4 and 6 months.

answer; (b) i believe its metabolic rate of the patient; plz check first