Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: Mahathir said it was fortunate that he had sought immediate treatment as soon as he had the mild heart attack, and this had enabled doctors to dilute the blood clot in his coronary artery. Mahathir, who will turn 81 next month, was rushed to the NHI early Thursday morning after complaining of chest pains.

dilute