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
While preparing occlusal cavity for amalgam in mandibular first premolar, the bur 
Select and explain. 
A. Is kept absolutely vertical, B. Is tilted slightly buccally, C. Is tilted slightly lingually, D. Can be kept in any direction
C: Is tilted slightly lingually
Answer: C: Is tilted slightly lingually 
Explanation: None