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
A 60 year old man is diagnosed to be suffering from LEGIONNAIRES disease after returning home from attending a convention.He could have acquired it- 
Select and explain. 
A. From a person suffering from the infection while travelling in a aeroplane, B. From a chronic carrier in the convention center, C. From inhalaion of the aerosol in air conditioned room at convention center, D. By sharing an infected towel with a fellow delegate at the convention
C: From inhalaion of the aerosol in air conditioned room at convention center
Answer: C: From inhalaion of the aerosol in air conditioned room at convention center 
Explanation: None