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).

[Q]: Abstract: The urine urea nitrogen/urine creatinine excretion ratio (UUN/UCr) of a "spot" urine specimen obtained approximately 5 hours after the last meal of the day can be used to accurately calculate the urinary urea excretion for the previous 24-hour period. Because UUN excretion is largely determined by dietary intake of protein nitrogen, this method can be used to estimate dietary protein intake for the previous 24-hour period. Strategies for using this simple method for inexpensively and continuously monitoring dietary protein intake are discussed.
Which is the apt title for the abstract? option1: Simple method for monitoring 24-hour urinary urea nitrogen excretion. option2: Impact of myelography on the radiotherapeutic management of malignant spinal cord compression.
[A]: Simple method for monitoring 24-hour urinary urea nitrogen excretion.

[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.
[A]: Detection of antibodies to muramyl dipeptide, the adjuvant moiety of streptococcal cell wall, in patients with rheumatic fever.

[Q]: Abstract: We used Doppler echocardiography to quantitate the changes in intracardiac blood flow velocities and right and left ventricular stroke volumes in 80 normal human fetuses from 19 to 40 weeks gestation. Blood flow velocity spectra across the aortic, pulmonary, tricuspid, and mitral valves were digitized to obtain peak velocities (m/sec) and flow velocity integrals. Aortic and pulmonary diameters were measured at valve level from two-dimensional echocardiographic images and cross-sectional area was calculated assuming a circular orifice. Ventricular stroke volume was calculated as the product of the cross-sectional area of a great vessel and the flow velocity integral through that vessel. The pulmonary arterial and aortic diameters increased linearly with gestational age (r = .82, r = .84), and pulmonary arterial diameter consistently exceeded aortic diameter. There was a positive relationship between stroke volume and gestational age: stroke volume increased exponentially from 0.7 ml at 20 weeks to 7.6 ml at 40 weeks for the right ventricle (r = .87) and from 0.7 ml at 20 weeks to 5.2 ml at 40 weeks for the left ventricle (r = .91). Similar results were obtained for right and left ventricular and combined cardiac outputs. In 44% of the fetuses it was possible to quantitate both right and left ventricular stroke volumes. There was a close correlation between right and left ventricular stroke volumes in these fetuses (r = .96) and right ventricular stroke volume exceeded left ventricular stroke volume by 28%.(ABSTRACT TRUNCATED AT 250 WORDS)
Which is the apt title for the abstract? option1: Changes in intracardiac blood flow velocities and right and left ventricular stroke volumes with gestational age in the normal human fetus: a prospective Doppler echocardiographic study. option2: Surgical procedures are well tolerated by patients with asymptomatic chronic hepatitis.
[A]:
Changes in intracardiac blood flow velocities and right and left ventricular stroke volumes with gestational age in the normal human fetus: a prospective Doppler echocardiographic study.