This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Time Distribution, Epidemics, Subject name: Social & Preventive Medicine
Endemicity of a disease means: 
Select and explain. 
A. Occurs clearly in excess of normal expectancy, B. Is constantly present in a population, C. Exhibits seasonal pattern, D. Is prevalent among animals
B: Is constantly present in a population
Answer: B: Is constantly present in a population 
Explanation: Endemic Is the constant presence of a disease agent in a defined geographical area ; refers to 'usual or expected frequency' of a disease in a population. For instance, common cold is endemic because somebody always has one. Endemic diseases in India are : Measles, mumps, rubella, chicken pox, peussis, TB, HIV, Cancers, diabetes, hypeension etc. Epidemics can arise from uncontrolled endemics also.