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': 'All are used in painful diabetic neuropathy, except- \nSelect and explain. \nA. Phenytoin, B. Local use of capsicum, C. Dextroamphetamine, D. Amitriptyline', 'role': 'user'}, {'content': "Answer: C \nExplanation: Chronic, painful diabetic neuropathy is difficult to treat but may respond to the following: * Intensive insulin therapy (strict glycaemic control) * Anticonvulsants (gabapentin, pregabalin, carbamazepine, phenytoin) * Other antidepressants (duloxetine) * Tricyclic antidepressants (amitriptyline, imipramine) * Substance P depleter (capsaicin--topical) * Opiates (tramadol, oxycodone) * Membrane stabilisers (mexiletine, intravenous lidocaine) * Antioxidant (alpha-lipoic acid) Reference : page 833 Davidson's Principles and practice of Medicine 22nd edition", 'role': 'assistant'}]