This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Nutritional Deficiencies, Subject name: Social & Preventive Medicine
[{'content': 'A woman of age 34 yrs has been taking large quantities of vitamins in hope that it would prevent many infections & cancers. Now she came with complaint of sleep disturbances, increased hair fall, anorexia, nausea, fissures & dryness of lips. What is the most likely cause of these symptoms? \nSelect and explain. \nA. Chronic Vitamin A toxicity, B. Chronic Vitamin K toxicity, C. Chronic Vitamin E toxicity, D. Chronic Vitamin D toxicity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Only fat-soluble vitamins can cause toxicity as they can be stored in the body. Given clinical features - sleep disturbances, hair loss, anorexia, nausea, skin desquamation are suggestive of Vitamin-A toxicity. Enlarged liver & papilloedema can also be seen in chronic Vit-A intoxication. High doses are teratogenic. Vitamin-D toxicity can cause hypercalcemia which results in anorexia, nausea, vomiting, thirst & drowsiness. The patient may lapse into coma, while cardiac arrhythmias & renal failure may occur.', 'role': 'assistant'}]