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
SI unit of the brightness of a point light source is 
Select and explain. 
A. Candela, B. Lumen, C. Lux, D. Lambe
A: Candela
Answer: A: Candela 
Explanation: DescriptionQuantity measured nameRecommended unitBrightness of point sourceLuminous intensityCandelaFlow of lightLuminous fluxLumenAmount of light reaching surfaceIllumination IlluminanceLuxAmount of light re-emitted by surfaceBrightness luminanceLambe