This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Urethra & Penis), Subject name: Surgery
[{'content': 'Penile carcinoma upto urethra stage - \nSelect and explain. \nA. T1, B. T3, C. T4, D. T2', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., T3 T- Primary tumorTx - Cannot be assessedTo - No evidence of primaryTis - In situ CATa - Noninvasive verrucous CAT1 - Subepithelial connective tissue invasionT2 - Corpus cavemosum or spongiosum invasionT3 - Invades urethra or prostateT4 - Involves other adjectent structures", 'role': 'assistant'}]