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': 'Which of the following is the most common trigger factor for bruxism? \nSelect and explain. \nA. Temporomandibular joint dysfunction, B. Pericoronitis, C. Discrepancy between centric relation and centric occlusion, D. Acute periodontal disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Etiology\n\nBruxism is a parafunctional activity associated with psychological disturbances and emotional stresses. It is seen in occupations associated with overstress.\nBruxism occurs when freedom in centric is lost. It results from occlusal interferences during sliding from centric relation to centric occlusion. Large discrepancy between centric relation and centric occlusion also contributes to bruxism. Absence of proper interdigitation during transitional dentition also contributes to bruxism.\nVarious systemic factors such as worm infestations, sub-clinical nutritional deﬁciencies, magnesium deﬁciency, allergies and endocrinal disorders have also been attributed.\nBruxomania is associated with certain cortical lesions of the CNS.\n\nRef: Textbook of orthodontics Gowrishankar 1st\xa0ed page no 557', 'role': 'assistant'}]