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': 'One of the following statements regarding pin retained restoration is NOT true \nSelect and explain. \nA. Pinholes should never be prepared at different levels on the tooth, B. A minimum of 0.5 mm clearance should be provided around the circumference of the pin for adequate condensation of the amalgam, C. Pinhole should located on a flat surface that is perpendicular to the proposed direction of the pinhole, D. The pinhole should be positioned no closer than 1 mm to DEJ and no closer than 1.5 mm to the external surface.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]