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: Pathology
[{'content': 'Increased susceptibility to breast cancer is likely to be associated with a mutation in the following gene -a) P53 b) BRCA-1 c) Retinoblastoma (Rb)  d)  H-Ras \nSelect and explain. \nA. ab, B. bc, C. ad, D. bd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]