<Tr> <Th_colspan="2"> Classification and external resources </Th> </Tr> <Tr> <Th> Specialty </Th> <Td> Biochemical Genetics </Td> </Tr> <Tr> <Th> ICD - 10 </Th> <Td> E50. 6 - E50. 7 </Td> </Tr> <Tr> <Th> ICD - 9 - CM </Th> <Td> 264.6 - 264.7 </Td> </Tr>

Deficiency of which of the following causes xerophthalmia