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: Dental
[{'content': 'Single  massive  dose  of  vitamin  A  for  preventing  the deficiency in preschool children between the age of 1-6 years for every 6 months is: \nSelect and explain. \nA. 2,000 IU, B. 20,000 IU, C. 2,00,000 IU, D. 20,00,000 IU', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Prevention and control of vitamin A deficiency in children\xa0\nIt\xa0 is\xa0 estimated that large\xa0 number of children suffer from sub-clinical deficiency of vitamin A.\xa0 Under the programme,\xa0doses of vitamin A are given to all children under 5 years of age. The first dose (1\xa0 lakh units)\xa0 is given at nine months of age\xa0 along\xa0 with\xa0 measles\xa0 vaccination.\xa0 The\xa0 second\xa0 dose (2\xa0 lakh\xa0 units)\xa0 is\xa0 given\xa0 after\xa0 9\xa0 months.\xa0 Subsequent\xa0 doses (2\xa0 lakh\xa0 units\xa0 each)\xa0 are\xa0 given\xa0 at six\xa0 months\xa0 intervals\xa0 upto 5\xa0 years\xa0 of age.\xa0 All\xa0 cases\xa0 of severe\xa0 malnutrition\xa0 to\xa0 be given one additional dose of vitamin A.', 'role': 'assistant'}]