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
Class III amalgam restoration is not indicated in which of the following cases? 
Select and explain. 
A. Extensive preparation with only minimal facial involvement, B. Mesial surface of canines, C. The gingival margin involves primarily cementum, D. Moisture control is difficult
B: Mesial surface of canines
Answer: B: Mesial surface of canines 
Explanation: There are few indications for a Class III amalgam restoration. It is generally reserved for the distal surface of maxillary and mandibular canines if:

The preparation is extensive with only minimal facial involvement.
The gingival margin involves primarily cementum.
Moisture control is difficult.  

For esthetic reasons, amalgam is rarely indicated for the proximal surfaces of incisors and the mesial surface of canines.
However, amalgam may be used for any Class III restoration that does not involve the facial surface or undermine the incisal corner. 
Reference: Sturdevant operative dentistry. 4th edition: page no.744,743