This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Healthy carrier is seen in all except 
Select and explain. 
A. Polio, B. Measles, C. Cholera, D. Diphtheria
B: Measles
Answer: B: Measles 
Explanation: By type carriers can be classified into Incubatory carriers : Sheds infectious agents during incubation period of disease. Eg. Measles, Mumps etc. Convalescent carriers : Who continue to shed the disease agent during the convalescent period. Eg. Typhoid, Dysentery etc. Healthy carriers : They are victims of subclinical infection who have developed carrier state without suffering from ove disease, but are neveheless shedding the disease agents. Eg. Polio, Cholera, Meningococcal meningitis, Salmonellosis and Diphtheria Reference: Park&;s Textbook of Preventive and Social medicine; 24th edition; Page no. 101