<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 51-year-old man presents complaining of decreased vibratory sense in his lower limbs. Physical exam reveals a widened pulse pressure and a decrescendo murmur occurring after the S2 heart sound. After further questioning, he also reports he experienced a maculopapular rash over his trunk, palms and soles many years ago that resolved on its own. In order to evaluate the suspected diagnosis, the physician FIRST tested for which of the following?? A: Agglutination of antibodies with beef cardiolipin, B: Indirect immunofluoresence of the patients serum and killed T. palladium, C: Cytoplasmic inclusions on Giemsa stain, D: Agglutination of patients serum with Proteus O antigens, E: Gram negative, oxidase positive, comma shaped bacteria growing at 42 degrees C,  <response>: This is a clinical vignette describing a patient with signs and symptoms suggestive of syphilis infection, including decreased vibratory sense in the lower limbs tabes dorsalis, widened pulse pressure and decrescendo diastolic murmur aortic regurgitation, and history of maculopapular rash. The question asks what test the physician should order first to evaluate for the suspected diagnosis of syphilis.Choice A describes testing for syphilis using the VDRL Venereal Disease Research Lab test, which looks for antibodies against cardiolipin released from damaged host cells. This is the standard serological screening test for syphilis.Choice B describes testing for syphilis using immunofluorescence against T. pallidum, the spirochete that causes syphilis. This is also an appropriate serological test. Choices C, D and E describe tests for other infections not relevant to diagnosing syphilis.A: Agglutination of antibodies with beef cardiolipin 