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
[{'content': 'A 15-year-old girl has been losing weight and exercising vigorously. She feels overweight and wants to lose more weight. On examination, she is thin with muscle wasting. Which of the following physical signs is also suggestive of the diagnosis? \nSelect and explain. \nA. salivary gland enlargement, B. coarse body hair, C. diarrhea, D. tachycardia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Salivary gland enlargement occurs both in anorexia nervosa (AN) and bulimia (BN). Other common findings in AN include constipation, bradycardia, hypotension, hypercarotinemia, and soft downy hair growth (lanugo). Menses are usually absent.', 'role': 'assistant'}]