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
As a general rule in borderline crowding cases of a broad facial type: 
Select and explain. 
A. An expansion treatment should be carried out, B. Extraction therapy, should be considered, C. No treatment required, D. Only surgical treatment required
A: An expansion treatment should be carried out
Answer: A: An expansion treatment should be carried out 
Explanation: Key comment:
In broad face type(brachycephalic) patient with mild crowding, if expansion is possible, it is the first line of treatment of choice rather than extraction.