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': 'All of the following statements about slotretained complex amalgams are true except _____. \nSelect and explain. \nA. Slots should be 1.5 mm in depth., B. Slots should be 1 mm or more in length., C. Slots may be segmented or continuous., D. Slots should be placed at least 0.5 mm inside the DEJ.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The longer a slot, the better. They should be inside the DEJ and prepared with an inverted cone bur to a depth of 1 mm.', 'role': 'assistant'}]