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
One of the following statements regarding pin retained restoration is NOT true 
Select and explain. 
A. 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.
A: Pinholes should never be prepared at different levels on the tooth
Answer: A: Pinholes should never be prepared at different levels on the tooth 
Explanation: None