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': "Haemoglobin unlike myoglobin shows - \nSelect and explain. \nA. Parabolic curve of oxygen association, B. Co-operative effect of combine O2, C. Co-operative index of 81, D. Hill's coefficient of 1", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hemoglobin shows Co-operative binding kinetics i.e. binding of one O2 facilitates binding of other O2 molecules.\nHb-O2 dissociation curve is sigmoid (not parabolic).\nHill coefficient for hemoglobin is 2.8, whereas it is 1 for myoglobin.\nThere is no term like cooperative index.', 'role': 'assistant'}]