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 pressor response to exogenously infused angiotensin II is decreased in normal human and ovine pregnancy when compared to the nonpregnant state. This study was designed to determine the mechanism for decrease in target organ sensitivity by examining pregnancy-induced changes in the affinity and number of angiotensin II receptors in myometrium from pregnant and nonpregnant sheep. Tissues were obtained from four ovariectomized sheep given 50 micrograms estradiol-17 beta on days 3 and 5 postsurgery and from four pregnant sheep (mean gestational age 136 days). Binding of 125I-angiotensin II was determined in particulate fractions of myometrium prepared by differential centrifugation. The 125I-angiotensin II binding to myometrial preparations was specific, saturable, and linear with protein concentration. In the nonpregnant group, binding capacity for angiotensin II in myometrium was 502 +/- 76 fmol/mg protein, whereas in the pregnant group it was 184 +/- 65 fmol/mg protein (P less than .01). Receptor affinity also was less (Kd 1.72 +/- 0.39 nM) during pregnancy compared with the nonpregnant sheep uterus (3.9 +/- 0.80 nM; P less than .01). These data support the hypothesis that the decrease in target organ sensitivity to exogenously administered angiotensin II during pregnancy in human and ovine species may be secondary to a decrease in the total number and affinity of specific angiotensin II receptors.
Which is the apt title for the abstract? option1: Pregnancy causes a decrease in the number and affinity of myometrial angiotensin II receptors. option2: Roentgenographic findings of the cervical spine in asymptomatic people.
answer:
Pregnancy causes a decrease in the number and affinity of myometrial angiotensin II receptors.

question:
Abstract: Microsporum nanum is a dermatophyte that can cause disease in both man and animals and is most frequently associated with ringworm infection in pigs. Human infections are rare in the literature. Three new cases of human M. nanum infection are reported here. Two patients had inflammatory tinea faciei and one had tinea cruris. The patients were successfully treated with clotrimazole or miconazole cream, sometimes combined with griseofulvin. All three patients were hog farmers and lived in the same small rural area. Occupational exposure is suggested as the cause of infection.
Which is the apt title for the abstract? option1: Microsporum nanum infection in hog farmers. option2: The acidosis of cholera. Contributions of hyperproteinemia, lactic acidemia, and hyperphosphatemia to an increased serum anion gap.
answer:
Microsporum nanum infection in hog farmers.

question:
Abstract: The authors describe four cases of subependymoma studied with computed tomography (CT) and review 18 previously reported cases in an attempt to define the most characteristic CT presentation of this rare, benign tumor. Subependymoma usually appears as an isodense, or even hypodense, intraventricular tumor on plain CT scan and shows minimal or no enhancement in postcontrast studies. Differential diagnosis between subependymoma and the more malignant true ependymoma is difficult, particularly when the tumor occurs in the posterior fossa. Recognition of subependymoma should prompt the surgeon to attempt radical tumor removal because it can be achieved without sacrificing contiguous tissue and carries a good prognosis.
Which is the apt title for the abstract? option1: Symptomatic subependymoma: report of four new cases studied with computed tomography and review of the literature. option2: Biliary stricture dilatation: multicenter review of clinical management in 73 patients [letter]
answer:
Symptomatic subependymoma: report of four new cases studied with computed tomography and review of the literature.