This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'Nephelometry is a technique used in the measurement of: \nSelect and explain. \nA. Refraction of light, B. Immunoglobulins, C. Size of renal stones, D. Optical density of fluids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: InternetExplanation:Nephelometry is a technique used in immunology to determine levels of the antibodies Immunoglobulin M, Immunoglobulin G, and Immunoglobulin A.It is performed by measuring the turbidity in a water sample by passing lightIn nephelometry the measurement is made by measuring the light passed through a sample at an angle.This technique is widely used in clinical laboratories because it is relatively easily automated.It is based on the principle that a dilute suspension of small particles will scatter light (usually a laser) passed through it rather than simply absorbing it.The amount of scatter is determined by collecting the light at an angle (usually at 30 and 90 degrees).', 'role': 'assistant'}]