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: Calcium carbonate appears to be as effective as aluminum hydroxide in binding dietary phosphorus in hemodialysis patients. The long-term safety of this medication appears acceptable in view of today's therapeutic options.
Which is the apt title for the abstract? option1: Calcium carbonate as a phosphate binder in hemodialysis patients. option2: Contact hypopigmentation from electrocardiograph electrodes [letter]
Output:
Calcium carbonate as a phosphate binder in hemodialysis patients.