This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
Iceberg phenomena is not seen in 
Select and explain. 
A. Measles, B. AIDS, C. Polio, D. Rubella
A: Measles
Answer: A: Measles 
Explanation: The only source of measles infection is case. Carriers are not know to occur. So, iceberg phonomena is not seen in measles. Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition - Pgno 147