ur patient is a 54-year-old male who has recently completed a round of chemotherapy following successful surgery to remove a cancerous tumor from his colon. He complains of a stiff neck, severe headache, and chronic nausea. On taking a history of recent events, you discover his hobby is to race homing pigeons. You suspect meningitis and order a lumbar puncture to sample the spinal fluid, which you negatively stain. The results are shown here. A nitrate assimilation test on the sample was negative, and there was pigmentation on birdseed agar when cultured.What is your diagnosis of the infectious agent, given the patient history, the staining results, and the test results? Multiple Choice Cryptococcus neoformans Listeria monocytogenes Haemophilus influenzae Streptococcus pneumoniae