This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
“White Fingers” may result from which of the following occupational hazards 
Select and explain. 
A. Heat, B. Cold, C. Vibration, D. UV Radiation
C: Vibration
Answer: C: Vibration 
Explanation: After some months or years of exposure to vibrations (10 – 500 Hz), the fine blood vessels of fingers may become extremely sensitive to spasm, known as ‘White fingers’.
White fingers are a form of Raynaud’s Disease. Vibration white finger is the vascular component of ‘hand-arm vibration syndrome (HAVS)’.