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).

[Q]: Abstract: Repetitive chest pain of obscure origin is commonly encountered in older children and adolescents. A questionnaire study was conducted to determine the long-term outcome in 31 patients diagnosed as having idiopathic recurrent chest pain after an average 4.1-year follow-up period. Although 45 percent reported having had persistent symptoms, chest pain had disappeared in 81 percent of those followed more than 3 years. Equally reassuring is the fact that in no case did occult disease subsequently appear to account for the initial symptoms. This study supports the current clinical approach of limited diagnostic evaluation and reassurance in the management of these patients.
Which is the apt title for the abstract? option1: The natural history of idiopathic chest pain in children. A follow-up study. option2: Cumulative effects of quinidine and aspirin on bleeding time and platelet alpha 2-adrenoceptors: potential mechanism of bleeding diathesis in patients receiving this combination.
[A]: The natural history of idiopathic chest pain in children. A follow-up study.

[Q]: Abstract: The recognition of macromolecule abnormalities in various metabolic or immunologic related disease states has led to the use of plasma exchange for therapeutics. Limitations of plasma exchange, however, exist. Membrane plasma filtration provides a practical alternative. Solute removal can be made selective by the choice of operating conditions as temperature and the selection of the membrane/module design. The optimal temperature range is a function of the plasma type, solute concentrations and membrane system. Operation at below physiologic temperature (cryofiltration) is particularly suited for the removal of cold aggregative solutes, while operation at near or above physiologic temperature is more suited for the separation of solutes having large size differences at normal physiologic temperature. Membrane filtration is simple and safe to perform, is more selective than plasma exchange, does not require plasma product infusion and is more versatile than selective sorption in its applications.
Which is the apt title for the abstract? option1: Blood detoxification by membrane plasma filtration. option2: Leads from the MMWR. Tuberculosis--United States, 1985.
[A]: Blood detoxification by membrane plasma filtration.

[Q]: Abstract: In a series of 715 patients operated on by microsurgical techniques for intracranial saccular aneurysms between 1970 and 1980, part of the aneurysmal sac was not obliterated in 28 aneurysms in 27 patients (3.8% of 715 cases). Clinical follow-up evaluation for 8 years (range 4 to 13 years) and angiographic follow-up studies for 6 years (range 2 to 10 years) in these 27 cases revealed that one aneurysm rest increased in size and bled twice, five were spontaneously obliterated, two decreased in size, 13 remained unchanged, and in seven cases no late follow-up angiography was performed. The incidence of rebleeding from an aneurysm rest was 3.7% of the 27 in whom the sac was not obliterated and 0.14% of all 715 patients who were operated on.
Which is the apt title for the abstract? option1: Natural history of postoperative aneurysm rests. option2: Neutropenia and fever in patients undergoing combination chemotherapy for malignant germ cell tumors of the ovary.
[A]:
Natural history of postoperative aneurysm rests.