<Tr> <Th_colspan="2"> Adverse drug reaction </Th> </Tr> <Tr> <Td_colspan="2"> A red skin rash due to a drug reaction </Td> </Tr> <Tr> <Th_colspan="2"> Classification and external resources </Th> </Tr> <Tr> <Th> ICD - 10 </Th> <Td> T88. 7, Y40 - Y59 </Td> </Tr>

Which of the following is not a source of a​ drug