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: Dental
The systolic blood pressure in normal healthy males of age group of 40 — 60 has a normal distribution with a mean of 130 in a sample of 100. People with systolic blood pressure more than 130 will be: 
Select and explain. 
A. 100, B. 75, C. 50, D. 25
C: 50
Answer: C: 50 
Explanation: None