This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histo Pathology, Subject name: Pathology
Microscopy which can be performed with minimum optical illumination? 
Select and explain. 
A. Dark field, B. Phase contrast, C. Bright-field microscopy, D. Fluorescent microscopy
A: Dark field
Answer: A: Dark field 
Explanation: Ans. (a) Dark fieldDarkfield microscopy reduces the amount of light entering the lens system of a microscope in two ways. First, it blocks the center of the beam of light that would otherwise fill the objective lens. Second, only the light which is scattered by the specimen and enters the objective lens is seen