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
[{'content': 'The fourth dimension of habit as described by Pinkham: \nSelect and explain. \nA. Direction, B. Frequency, C. Intensity, D. Duration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Triad of a Habit\nThe deleterious effects produced by a habit depends upon the three factors – Duration, Frequency & Intensity.\n\xa0a. Duration: The amount of time spent indulging in the habit.\xa0\n\xa0b. Frequency: The number of times the habit is activated in a day.\n\xa0c. Intensity: The vigor with which the habit is performed.\nKey Concept:\nPinkham has added a fourth dimension to oral habits, ie.,\xa0Direction.', 'role': 'assistant'}]