Answer: D (maxillary 1st molar)
The largest tooth in volume and the most complex in root and canal anatomy, the “six year molar” is possibly the most treated and least understood posterior tooth. Studies vary in the number of canals present however, the clinician should always assume there are two canals in the mesiobuccal root until it is proven that there is only one. In addition, the palatal often curves toward the buccal at the apical 1/3 that may not be obvious on a radiograph.
In contrast, according to a study by Skidmore and Bjorndal, 1/3 of mandibular first molars had four root canals.
References
1. Cohen S et al. Pathways of the Pulp, 8th edition, Mosby, 2002.
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