Adverse drug reactions are appreciably harmful or unpleasant reactions resulting from an intervention related to the use of medical products, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product. Given medical case reports extracted from MEDLINE, the task is to classify whether the case report mentions the presence of any adverse drug reaction. Classify your answers into non-adverse drug event and adverse drug event.

[Q]: TEN is a disease of both children and adults, but TEN in early infancy is a rare event; only two well-documented cases in infants less than 6 months of age have been reported.
[A]: non-adverse drug event


[Q]: Anti-tuberculous drugs had been stopped on the 2nd day of therapy due to development of optic neuritis secondary to ethambutol administration at another hospital.
[A]: adverse drug event


[Q]: Pseudomembranous colitis readily occurs in at least certain population groups receiving trimethoprim-sulfamethoxazole.
[A]:
adverse drug event