<prompt> An 8-year-old male is admitted to the hospital with a drooping right eyelid ptosis. The initial diagnosis is Horners syndrome. Which of the following additional signs on the right side would confirm the diagnosis?Constricted pupilDry eyeExophthalmosPale, blanched face  <response>: a Source: GAS 45, 882, 895, 980-981; GA 190, 496Horners syndrome involves interruption of sympathetic supply to the face. This results in ptosis drooping eyelid, miosis constricted pupil, and anhydrosis lack of sweating of the face. The eye is lubricated by the lacrimal gland, which secretes in response to parasympathetic stimulation, and would be unaffected. Exophthalmos protrusion of the globe is frequently caused by hyperthyroidism and is not present in Horners syndrome. Loss of sympathetic innervation leads to unopposed vasodilatation of the vessels to the face, leading to flushing rather than paleness. 