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
The orifice of the fourth canal in a maxillary molar is usually found: 
Select and explain. 
A. Under the Distofacial cusp, B. Lingual to the orifice of the Mesiofacial canal, C. On a line running from the distofacial orifice to the Mesiofacial orifice, D. On a Line running from the Lingual orifice to the Distofacial orifice
B: Lingual to the orifice of the Mesiofacial canal
Answer: B: Lingual to the orifice of the Mesiofacial canal 
Explanation: None