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: A patient that received methadone for cancer-associated pain developed myoclonus as a side effect.
Example Output: adverse drug event

Example Input: Acute chest pain is a common presentation in emergency.
Example Output: non-adverse drug event

Example Input: Acne provoked by gold seems not to have been described elsewhere.
Example Output:
adverse drug event