This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Theory of Pshycosexual development was given by 
Select and explain. 
A. Freud, B. Piaget, C. Skinner, D. Kaplan
A: Freud
Answer: A: Freud 
Explanation: Freud