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: Pathology
[{'content': 'The condition highlighted by the arrow in the occlusal radiograph in a 8 year old child could be due to: \nSelect and explain. \nA. Non-vital tooth, B. Impacted tooth, C. Ghost tooth, D. Mesiodens', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]