instruction:
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).
question:
Abstract: The human chorionic gonadotropin (hCG) beta subunit curve of normal singleton in vitro fertilization (IVF) pregnancies shows cyclic peaks during the first 56 days after embryo transfer (ET). This phenomenon is not demonstrable in normal spontaneous conceptions. The hCG curves of 151 singleton IVF pregnancies achieved by transfer of two, three, and four embryos therefore were compared statistically with the hCG curves of singleton IVF pregnancies achieved by transfer of only one embryo. The hCG levels of singleton IVF pregnancies achieved by transfer of more than one embryo had statistically higher hCG levels at 7 and 8, 19 and 20, and 37 and 38 days after ET. In a separate evaluation it was observed that declines in hCG levels of normal singleton IVF pregnancies preceded four of five first-trimester abortion incidence peaks of singleton IVF pregnancies. The observed cyclic hCG secretion may be indicative of early embryo deaths. This observation supports the contention that multiple ET results in significantly more multiple implantations than previously appreciated. Thus embryo survival in utero may represent another major contributory factor to success or failure of IVF.
Which is the apt title for the abstract? option1: Does cyclic human chorionic gonadotropin secretion indicate embryo loss in in vitro fertilization? option2: Heparin-induced thrombocytopenia and recurrent thrombosis in pregnancy. A case report.
answer:
Does cyclic human chorionic gonadotropin secretion indicate embryo loss in in vitro fertilization?

question:
Abstract: The St Georg modular knee replacement has been studied in 59 cases with an observation period ranging from 28 to 73 months. In 47% of the knees both compartments were replaced; five of the six poor results were in this group. These were revised to a hinge arthroplasty or, in one case, to an arthrodesis. Other complications were few and insignificant. There were no infections. We concluded that unicompartmental knee arthroplasty can be recommended when joint involvement is localised to one compartment only. With more generalised joint disease we prefer a semiconstrained total condylar prosthesis.
Which is the apt title for the abstract? option1: St Georg modular knee prosthesis. A two-and-a-half to six-year follow-up. option2: Angiofibroma: treatment trends in 150 patients during 40 years.
answer:
St Georg modular knee prosthesis. A two-and-a-half to six-year follow-up.

question:
Abstract: Intraoral patch testing was performed in 3 subjects, 2 of whom were contact sensitive to nickel. Maxillary acrylic plates carrying test pieces containing 66% nickel were applied for 48 h, and readings were performed 24 h after removal. Few if any clinical signs were detected, but biopsies from the mucosal contact sites showed lichenoid reactions. Biopsies from control sites showed no or slight non-specific inflammatory reactions.
Which is the apt title for the abstract? option1: A new method for intraoral patch testing. option2: Subtyping phosphoglucomutase-1 in semen stains and bloodstains: a report on the method.
answer:
A new method for intraoral patch testing.