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: ENT
Patient is having scanty, foul smelling discharge from middle ear, develops fever, headache and neck rigidity. CT of the temporal lobe shows a localized ring enhancing lesion, which of the following is least likely cause of this condition? 
Select and explain. 
A. S. aureus, B. Pseudomonas, C. S.Pneumoniae, D. H. influenza
D: H. influenza
Answer: D: H. influenza 
Explanation: Commonest organisms in otogenic brain abscess include gram negative (Proteus, E coli, Pseudomonas) and anaerobic bacteria along with Staphylococcus and Pneumocci. H. Influenza infection is a rare cause of otogenic abscess.