This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Which of the following is known as the "guardian of the genome"- \nSelect and explain. \nA. p53, B. Mdm2, C. p14, D. ATM', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The discovery of the tumor suppressor protein known as p53, and the process of uneahing its functions came about as a result the effos of thousands of scientists around the globe. In p53: The Gene that Cracked the Cancer Code, science writer Sue Armstrong takes a fresh look at the exciting breakthroughs and disappointing setbacks that characterized this endeavor. The result, according to reviewers Anna Mandinova and Sam W. Lee, is a brilliant narrative that captures the enthusiasm and excitement of scientific discovery, as well as the daily struggles and challenges faced by cancer researchers.', 'role': 'assistant'}]