You will be given a definition of a task first, then some input of the task.
Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).

Abstract: Endomyocardial biopsy is most frequently used to establish a definitive diagnosis of myocarditis, especially since this disorder has been treated with immunosuppressive therapy. Recent diagnostic criteria (the "Dallas Classification") are reviewed, and pitfalls and limitations are discussed.
Which is the apt title for the abstract? option1: Diagnosis of myocarditis by endomyocardial biopsy. option2: Obliteration of compressed frontal sinus [letter]
Output:
Diagnosis of myocarditis by endomyocardial biopsy.