Answer:
Ego
Step-by-step explanation:
Freud typified personality as a struggle in which one of the personality structures is caught in the middle of the conflict between the other two structures. This part caught in the middle is the ego.
Sigmund Freud in his psych model divides the human psyche into the id, ego and superego. The ego mediates between the unrealistic, primitive id and the external real world. While the id, being the most primitive of the three structures is concerned with instant gratification of basic physical needs and urges and the superego concerned with maintaining social rules, morals and standards, the ego is being pragmatic, is concerned in maintaining a balance between the two structures.