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
A screening test was carried out among 120 people and 20 had the disease. 40 showed test positive out of which 15 had the disease. What is the specificity of the test? 
Select and explain. 
A. 50%, B. 65%, C. 75%, D. 25%
C: 75%
Answer: C: 75% 
Explanation: None