This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
All of the following are true regarding Legionella except. 
Select and explain. 
A. Legionella can be grown on complex media, B. L. pneumophila serogroup 1 is the most common serogroup isolated from humans, C. Legionella are communicable from infected patients to others, D. L. pneumophila is not effectively killed by polymorphonuclear leukocyte
C: Legionella are communicable from infected patients to others
Answer: C: Legionella are communicable from infected patients to others 
Explanation: Ans. is 'c' i.e., Legionella are communicable from infected patients to othersRef: Harrison, 19th/e, p. 1014; Ananthanarayan, 9th/e, p. 401* No man to man transmission occurs.* Aspiration is predominant mode of transmission. Other modes include aerosolization, direct instillation into lungs.* Aerosolization by AC, nebulizer, humidifier, overhead showers and direct installation into lungs are other modes.* Aerosol spread leading to epidemics.