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: Biochemistry
[{'content': 'The colour vision is governed by all of the following colour sensitive pigments EXCEPT:- \nSelect and explain. \nA. Porphyropsin, B. Transducin, C. Iodopsin, D. Cyanopsin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The colour vision is governed by colour sensitive pigments-porphyropsin (red), iodopsin (green) and\xa0 cyanopsin (blue).\nReference: Satyanarayana- Biochemistry, 3rd edition, pg-122', 'role': 'assistant'}]