This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'SI unit of the brightness of a point light source is \nSelect and explain. \nA. Candela, B. Lumen, C. Lux, D. Lambe', 'role': 'user'}, {'content': 'Answer: A \nExplanation: DescriptionQuantity measured nameRecommended unitBrightness of point sourceLuminous intensityCandelaFlow of lightLuminous fluxLumenAmount of light reaching surfaceIllumination IlluminanceLuxAmount of light re-emitted by surfaceBrightness luminanceLambe', 'role': 'assistant'}]