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
Which one of the following diseases CANNOT be eradicated 
Select and explain. 
A. Leprosy, B. Tuberculosis, C. Measles, D. Pertussis
A: Leprosy
Answer: A: Leprosy 
Explanation: None