This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Which of the following is the most likely explanation for the dental abnormalities in bulimia nervosa (BN)? 
Select and explain. 
A. self-induced physical trauma, B. self-induced vomiting, C. excess cortisol levels, D. osteoporotic changes
B: self-induced vomiting
Answer: B: self-induced vomiting 
Explanation: Recurrent vomiting and exposure of the teeth to stomach acid leads to loss of dental enamel and eventual chipping and erosion of the teeth. The vomiting may be manually induced, but eventually most patients with bulimia (BN) are able to trigger vomiting at will.