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: Biochemistry
[{'content': 'A 30 year old female patient complains of irritability and nervousness. Patient gives history of consumption of oral contraceptives. Lab investigation reveals presence of xanthurenic acid in urine. This patient may be suffering from deficiency of: \nSelect and explain. \nA. Vitamin C, B. Vitamin B1, C. Vitamin B2, D. Vitamin B6', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pyridoxine\xa0deficiency\xa0is\xa0associated with neurological\xa0symptoms\xa0such\xa0as\xa0depression, irritability, nervousness and mental confusion. Convulsions and\xa0peripheral neuropathy are observed in severe deficiency.\nThe synthesis of\xa0niacin coenzymes (NAD+ and\xa0 NADP+)\xa0 from\xa0tryptophan\xa0is\xa0impaired. Xanthurenic acid, produced in high quantities is excreted in\xa0urine,\xa0which\xa0serves as a\xa0reliable index (particularly after tryptophan load test) for B6\xa0deficiency.\n\nSatyanarayana- Biochemistry, 3rd edition, pg-146', 'role': 'assistant'}]