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 Q]: Abstract: The presence of antibodies to muramyl dipeptide (MDP), an adjuvant structure of streptococcal peptidoglycan, was investigated in patients with acute rheumatic fever (ARF). The detection of these antibodies was done by an enzyme-linked immunosorbent assay with a synthetic multivalent MDP conjugate as an antigen. Sera from 33 of 54 children with ARF had detectable levels of antibodies to MDP at the time of diagnosis. Such antibodies could only be detected in sera from two of 52 healthy children and one of 21 children with acute poststreptococcal glomerulonephritis. The specificity of the antibodies to MDP was demonstrated by inhibition, with free MDP, of binding of the sera to the MDP conjugate. The possible use of these antibodies in the diagnosis of ARF and in screening for safe synthetic muramyl peptides in immunization of humans is discussed.
Which is the apt title for the abstract? option1: Detection of antibodies to muramyl dipeptide, the adjuvant moiety of streptococcal cell wall, in patients with rheumatic fever. option2: Relationship between abnormalities of coagulation and fibrinolysis and postoperative intracranial hemorrhage in head injury.
[EX A]: Detection of antibodies to muramyl dipeptide, the adjuvant moiety of streptococcal cell wall, in patients with rheumatic fever.

[EX Q]: Abstract: Healthy male rats were exposed to a chronic ingesta of an isotonic NaCl solution during a period of four months. Two different preparations were utilized to study the effect of this treatment on the active mechanisms of Na+ reabsorption of kidney proximal tubular cells: outermost kidney cortex slices (rich in proximal tubules) and inside-out basolateral plasma membrane vesicles prepared from the same tissue. It was found that the activity of the ouabain-insensitive, Na-pump of basolateral plasma membranes of kidney proximal tubular cells was increased in about 70%, whereas the ouabain-sensitive, Na,K-pump activity did not change with the experimental treatment. These results represent a strong support to the two Na-pump's hypothesis since the treatment affected the Na-pump differentially without affecting the Na,K-pump.
Which is the apt title for the abstract? option1: Effect of a high NaCl diet on the active mechanisms of Na+ extrusion in rat kidney. option2: Cutaneous and subcutaneous metastases of lung cancer. Clinical characteristics.
[EX A]: Effect of a high NaCl diet on the active mechanisms of Na+ extrusion in rat kidney.

[EX Q]: Abstract: The severity of the symptoms of endometriosis has not always correlated well with the anatomic severity of the disease. This lack of correlation may be due to variations in the metabolic activity of the endometriotic implants present at different stages of the disease. Because prostaglandin F (PGF) has been implicated as a hormonal mediator of the clinical symptoms of endometriosis, PGF synthesis and content was measured in implants from 14 patients with mild, moderate, severe, or extensive disease. To assess whether PGF production was related to the status of implants, the authors classified implants, based on gross and histologic criteria, as petechial or reddish; intermediate or brown; or powder-burn or black. PGF production of implants from patients with mild or moderate disease was greater than that of implants from patients with severe or extensive disease (P less than 0.05), and PGF content was similar for all stages of endometriosis. Petechial implants produced twice the amount of PGF than intermediate implants (P less than 0.05), which in turn produced more PGF than powder-burn implants (P less than 0.05). Powder-burn implants did not have the in vitro capacity to produce PGF, and the amount of PGF contained in implants of all classes was similar. Therefore, endometriotic implant PGF production and possibly other biochemical activities are dependent on the physical status of the implant. The classification of implants by morphologic appearance may afford additional assistance in determining the prognosis of the disease and in the examination of the subtle effects of the disease on symptoms.
Which is the apt title for the abstract? option1: Classification of endometriotic implants by morphologic appearance and capacity to synthesize prostaglandin F. option2: Acute myocardial infarction in a young woman taking oral contraceptives. A case report.
[EX A]:
Classification of endometriotic implants by morphologic appearance and capacity to synthesize prostaglandin F.