This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Surgery, Subject name: Surgery
[{'content': '40 year female presents to surgical OPD with C /O breast heaviness O/e following finding is seen. What is the T stage of this malignancy? \nSelect and explain. \nA. T3, B. T4a, C. T4b, D. T4c', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The video depicts extension of tumor to chest wall . T4a Extension to chest wall (chest wall is formed by Ribs, Intercostal muscles, Serratus Anterior) T4b Ulceration , edema including Peau-D-Orange , Satellite nodules T4c T4a + T4b T4d Inflammatory breast cancer Not included in T4 Involvement of dermis alone Nipple retraction/ detion Involvement of Pectoralis major/ Pectoralis minor', 'role': 'assistant'}]