Definition: 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).
Input: Abstract: Eighty-four patients with haematuria were seen during 1976 and 1977. This symptom was investigated but no definite cause could be found. Five or more years later they were followed up. Although some patients had experienced further urological symptoms, none was found to have developed a malignancy in the genito-urinary tract. Possible causes of their bleeding are discussed. 
 Which is the apt title for the abstract? option1: A 5-year follow-up of undiagnosed haematuria. option2: Oral desensitization to trimethoprim-sulfamethoxazole in a patient with acquired immunodeficiency syndrome.
Output:
A 5-year follow-up of undiagnosed haematuria.