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
[{'content': 'Microorganisms that enter freshly laid eggs are \nSelect and explain. \nA. Salmonella, B. Brucella, C. Shigella, D. Vibrio cholerae', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]