This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'A six-month-old male  child was brought to the opd with  the  chief complaint of fever,  inability to feed  and  seizures since the morning. On  examination, the child was found to have altered sensorium and neck rigidity. A lumbar puncture was carried out and CSF sent for examination.  The  cytology  and biochemistry results were suggestive of pyogenic meningitis. Microscopic examination revealed the presence of Gram-negative  coccobacilli. On culture on blood agar , the  microbe shows the following phenomenon: \nSelect and explain. \nA. Satellitism, B. Motility, C. Pleomorphism, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: H.influenzae\xa0is\xa0a\xa0small\xa0(1.0\xa0x\xa00.3\xa0 µm),\xa0Gram-negative, non-motile, non-sporing bacillus, exhibiting considerable pleomorphism.\xa0In\xa0sputum, it\xa0usually occurs as\xa0 clusters\xa0of\xa0coccobacillary\xa0 forms,\xa0 while\xa0in\xa0CSF from meningitis cases, long, bacillary and filamentous forms\xa0 predominate. Cells from young cultures\xa0 (18- 24 hours)\xa0 are usually coccobacillary, while older cultures are distinctly pleomorphic.\xa0 Strains isolated from acute infections are often capsulated.\nThe bacillus\xa0 has\xa0 fastidious\xa0 growth\xa0 requirements.\xa0 The accessory growth\xa0 factors, named X and V,\xa0 present in blood are essential for growth.\xa0\nIt is\xa0 aerobic but grows anaerobically also. The optimum temperature is 3 7°C. It does not grow below 20°C. Some strains require\xa0 10% CO2,\xa0 especially for\xa0primary isolation from the clinical specimen. It grows on blood agar if a source of the V factor is\xa0 also provided.\xa0\nWhen S.aureus\xa0 is\xa0 streaked\xa0 across\xa0 a\xa0 plate\xa0of blood\xa0agar\xa0on which\xa0a\xa0specimen\xa0 containing\xa0 H.infiuenzae\xa0 has\xa0 been inoculated,\xa0 after overnight incubation, the colonies of H.influenzae\xa0 will\xa0 be\xa0 large\xa0 and well\xa0 developed\xa0 alongside\xa0 the streak of staphylococcus,\xa0 and smaller farther away.\xa0 This\xa0 phenomenon\xa0 is\xa0 called\xa0 satellitism\xa0 and demonstrates\xa0 the\xa0dependence\xa0 of H. influenzae\xa0 on\xa0 the V factor, which is available in high concentrations near staphylococcal growth\xa0 and\xa0 in\xa0 smaller\xa0 quantities\xa0 away from it. This is a routine test in clinical bacteriology for the identification of H. influenzae.\nReference: Ananthanarayan Panekar microbiology 8th ed page no 333,334', 'role': 'assistant'}]