This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transcription, Subject name: Biochemistry
[{'content': 'snRNA which is not the pa of spliceosome: \nSelect and explain. \nA. U1, B. U2, C. U3, D. U4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: snRNA- small nuclear RNA - U1, U2, U4, U5 and U6 are involved. They remove introns by forming base pairs with the consensus sequences at each end of the intron.', 'role': 'assistant'}]