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.

Input: Consider Input: Allergic contact dermatitis from 4-chloro-7-nitrobenzofurazan.

Output: adverse drug event


Input: Consider Input: The clinical and histologic presentation of this side effect and possible biochemical mechanisms of pathogenesis are discussed.

Output: non-adverse drug event


Input: Consider Input: We conclude that symptoms of a postdural puncture headache can mimic those of postpartum preeclampsia.


Output: non-adverse drug event