Which of the following best describes the 'working length' in root canal treatment?
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A
The total length of the root from crown to apex as measured on a radiograph
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B
The distance from a coronal reference point to the working terminus, typically 0.5-1mm short of the radiographic apex
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C
The length of the root canal file required to reach the apical foramen exactly
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D
The depth of the pulp chamber measured from the occlusal surface