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).

Ex Input:
Abstract: The murine IgG2a monoclonal antibody 6-19 binds to a wide variety of nonhematopoietic cells including human marrow-derived stromal cells but does not bind to marrow or peripheral blood cells. We studied the effects of this antibody and rabbit complement on marrow cells. Fibroblast colonies were eliminated from light density marrow cells by a single incubation with monoclonal antibody 6-19 and complement. The growth and composition of granulocytic and erythroid colonies were unaffected. Specific complement mediated cytotoxicity of the antibody was confirmed on passaged human fibroblasts derived from marrow (more than 99.6% of fibroblasts are killed by a single treatment). Similar results were obtained with human umbilical cord endothelial cells. In addition, such treatment abolished the initiation of Dexter culture stroma. Incubation of bone marrow cell suspensions with this antibody and complement will allow the study of stroma-free marrow cells in long-term liquid cultures.
Which is the apt title for the abstract? option1: Lysis of human fibroblast colony-forming cells and endothelial cells by monoclonal antibody (6-19) and complement. option2: Mechanism of cardiac arrhythmias induced by epinephrine in dogs with hypokalemia.

Ex Output:
Lysis of human fibroblast colony-forming cells and endothelial cells by monoclonal antibody (6-19) and complement.

Ex Input:
Abstract: Two patients with metastatic dysgerminoma of the ovary were treated with a combination of etoposide, bleomycin, and cisplatin at The University of Texas M.D. Anderson Hospital and Tumor Institute at Houston. Both patients achieved a complete remission. Patient 1 developed a massive recurrence in the para-aortic lymph nodes 21 months after diagnosis and treatment with right salpingo-oophorectomy alone. She received four cycles of chemotherapy and is free of disease 21 months from the start of chemotherapy. Patient 2 had Stage III dysgerminoma and a lymphangiogram positive for tumor in the para-aortic lymph nodes. After surgery she received three cycles of chemotherapy and is free of disease 20 months from the start of chemotherapy. Both complete remissions were documented with second-look laparotomy. Chemotherapy may be an alternative to radiotherapy for the treatment of metastatic dysgerminoma and should also be considered for selected patients with Stage I disease. A literature review further supports the conclusion that additional clinical trials might expand the indications for chemotherapy in patients with this disease.
Which is the apt title for the abstract? option1: Chemotherapeutic complete remission in patients with metastatic ovarian dysgerminoma. Potential for cure and preservation of reproductive capacity. option2: Creativity in marketing a nutrition counseling service.

Ex Output:
Chemotherapeutic complete remission in patients with metastatic ovarian dysgerminoma. Potential for cure and preservation of reproductive capacity.

Ex Input:
Abstract: An accurate diagnosis is essential in managing musculoskeletal problems in children. Active treatment is only occasionally necessary and should meet the criteria of being essential, effective, and prudent.
Which is the apt title for the abstract? option1: Philosophy of care. option2: 1H nuclear magnetic resonance study of intervertebral discs. A preliminary report.

Ex Output:
Philosophy of care.