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': 'Inter globular dentin results due to: \nSelect and explain. \nA. Failure of coalescence of calcospherites, B. Fracture of the dentin, C. Artifact in light microscopy, D. Disturbance in dentinal tubules', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]