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
Candidates (s) for global eradication by WHO
a. Malariab. Dracunculosis c. Polio d. Measles e. Chicken pox 
Select and explain. 
A. ab, B. abd, C. abc, D. bcd
D: bcd
Answer: D: bcd 
Explanation: None