This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Eating Disorders, Subject name: Psychiatry
[{'content': 'The following Clinical sign is seen in which Psychiatric disorder? \nSelect and explain. \nA. Mania, B. Depression, C. Necrophagia, D. Bulimia Nervosa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Patient with Bulimia Nervosa indulges in self-induced vomiting after binge eating. During vomiting, the knuckles will make contact with incisor teeth as the gag reflex kicks in. This leads to callus formation on the knuckles and is called Russel sign. Image 2 shows tooth staining or discolouration, loss of dental enamel and increased dental caries. Other consequences of purging include: Parotitis Hypokalemic and hypochloremic alkalosis Rarely esophageal or gastric tear during forceful vomiting', 'role': 'assistant'}]