This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cognitive development and defence mechanism, Subject name: Psychiatry
Fixation is a concept related to 
Select and explain. 
A. Psychosocial stages of development, B. Psychosexual stages of development, C. Cognitive stages of development, D. Hierarchy of needs
B: Psychosexual stages of development
Answer: B: Psychosexual stages of development 
Explanation: Fixation is concept introduced by Sigmund Freud, he explains this in his each stage of Psychosexual stages of development. Ref: Synopsis of Psychiatry, 11e, pg 157.