This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Best method of preventing transmission of MRSA infection is 
Select and explain. 
A. Hand wash, B. Antibiotics, C. Disinfecting surfaces, D. Fumigation of the ward
A: Hand wash
Answer: A: Hand wash 
Explanation: Measures for the control of staphylococcal infections in hospitals:*Isolation of patients with open staphylococcal lesion*Detection of staphylococcal lesions among doctors and health care workers*Hand washing is the oldest, simplest and most effective method of preventing MRSA and other cross infections.*Following strict aseptic precautions (Ref: Ananthanarayan 9th edition, p204)