This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
All of the following statements about Staphylococcus aureus are true, Except 
Select and explain. 
A. Most common source of infection is cross infection from infected people, B. About 30% of general population is healthy nasal carriers, C. Epidermolysin and TSS toxin are superantigens, D. Methicillin resistance is chromosomally mediated
A: Most common source of infection is cross infection from infected people
Answer: A: Most common source of infection is cross infection from infected people 
Explanation: The most common source of infection is human patients and carriers Animals and inanimate objects being less impoant. Ref: Textbook of Microbiology; Ananthanarayanan and Panicker; 10th Edition; Page No: 205