This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Papain acts an gamma globulin to form- \nSelect and explain. \nA. 2 Fc fragments, B. 2 Fab fragments, C. 1 Fab fragments, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: The enzyme papain can be used to cleave an immunoglobulin monomer into two Fab fragments and an Fc fragment. The enzyme pepsin cleaves below the hinge region, so a F(ab')2 fragment and a pFc' fragment is formed", 'role': 'assistant'}]