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
Most common form of Nocardial respiratory tract infection is ? 
Select and explain. 
A. Laryngitis, B. Pharyngitis, C. Tonsilitis, D. Pneumonia
D: Pneumonia
Answer: D: Pneumonia 
Explanation: Ans. is 'd' i.e.,Pneumonia Nocardia are 'gram positive' `acid fast' filaments. Nocardia are strict aerobes and paially urease and catalase positive. Since nocardiae are among the few aerobic microorganism that use paraffin as a carbon source, paraffin baiting can be used to isolate the organism from mixed culture.