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.

Example Input: Four of the aviators were allowed to continue on active duty with limitations and one was disqualified.
Example Output: non-adverse drug event

Example Input: Severely elevated serum lithium levels were found.
Example Output: non-adverse drug event

Example Input: There had been one episode of chest discomfort in her past history.
Example Output:
non-adverse drug event