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
Compute the median for the following set of data, 1,2,3,4,5,6: 
Select and explain. 
A. 3, B. 3.5, C. 4, D. 4.5
B: 3.5
Answer: B: 3.5 
Explanation: If the number of samples is an even number, the median is midway between the two middle scores. (3+4)/2=3.5 Ref : Medical biostatistics, 1st edition pg: 111