This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'What is the ratio of Kappa and lambda free light chains normally \nSelect and explain. \nA. 7:03, B. 6:04, C. 4:06, D. 3:07', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In a healthy individual, the total kappa tolambda ratio is roughly 2:1 in serum (measuring intact whole antibodies) or 1:1.5 if measuring free light chains, with a highly divergent ratio indicative of neoplasm. Ref Robbins 9/e p102', 'role': 'assistant'}]