This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
It is true regarding normal microbial flora present on skin and mucous membrane that 
Select and explain. 
A. It cannot be eradicated by antimicrobial agents, B. It is absent in the stomach due to acidic pH, C. It establishes in the body only after the neonatal period, D. The flora in the small bronchi is similar to that of the trachea
A: It cannot be eradicated by antimicrobial agents
Answer: A: It cannot be eradicated by antimicrobial agents 
Explanation: It is present in stomach soon after food. It establishes on body during labour and not after neonatal period. Lower respiratory tract ie below trachea is sterile.