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: A case of symptomatic granular cell tumor of the esophagus is described. Another 32 cases collected from the English literature are analyzed. The reported cases have occurred mostly in women of less than 50 years of age presenting with dysphagia. Excision of the lesion is curative.
Which is the apt title for the abstract? option1: Symptomatic granular cell tumor of the esophagus. option2: Computer communications. Correlation, regression, and residuals: a graphical representation (for the IBM, PC or Compatible).
answer:
Symptomatic granular cell tumor of the esophagus.

question:
Abstract: The course of a pregnant patient at term who was acutely exposed to carbon monoxide is described. A review of the fetal-maternal carboxyhemoglobin relationships and the differences in fetal oxyhemoglobin physiology are used to explain the recommendation that pregnant women with carbon monoxide poisoning should receive 100% oxygen therapy for up to five times longer than is otherwise necessary. The role of hyperbaric oxygen therapy is considered.
Which is the apt title for the abstract? option1: Acute carbon monoxide poisoning during pregnancy. option2: Immune haemolytic anaemia and nomifensine treatment in north west England 1984-85: report of six cases.
answer:
Acute carbon monoxide poisoning during pregnancy.