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': 'Which of the following technique is meant for the preparation of curved canal? \nSelect and explain. \nA. Double flare technique, B. Modified double flare technique, C. Crown down technique, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Modiﬁed double ﬂare technique:\xa0\xa0\n\nMeant for curved canal.\nIn this, preparation was commenced in the coronal part of the root canal.\nA #40 Flex R file was instrumented in the straight part of the canal, using the balanced force technique.\nSequentially, larger sizes of files were used to instrument the straight part of the canal using the balanced force technique and\xa0 the coronal 4 to 5 mm of the root canal was instrumented with Gates-Glidden drills.\nA #20 Flex R file was taken to the working length and the canal prepared using the balanced force technique by sequential use of files.\nPreparation at the working length was continued until clean dentin was removed, the master apical varying between #40 and 45.\n\nTextbook of Endodontics Nisha GARG 3rd ED', 'role': 'assistant'}]