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: Dental
Habit developed under psychological cause is: 
Select and explain. 
A. Non Compulsive habits., B. Unintentional habits., C. Useful habits., D. Intentional habits.
D: Intentional habits.
Answer: D: Intentional habits. 
Explanation: None