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
As per WHO guidelines, iodine deficiency disorders are endemic in the community when prevalence of goitre in school age children is more than – 
Select and explain. 
A. 1%, B. 5%, C. 10%, D. 15%
B: 5%
Answer: B: 5% 
Explanation: None