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
Microorganisms that enter freshly laid eggs are 
Select and explain. 
A. Salmonella, B. Brucella, C. Shigella, D. Vibrio cholerae
A: Salmonella
Answer: A: Salmonella 
Explanation: Ans. is 'a' i.e., Salmonella . Salmonella can enter through the shell if eggs are left on contaminated chicken feed or feces and grow inside.