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
Wind velocity is normally recorded at a height of – 
Select and explain. 
A. 1 metre, B. l0 metres, C. 15 metres, D. 20 metres
B: l0 metres
Answer: B: l0 metres 
Explanation: None