The occurrence of dental caries in a population at a given point of time may be termed as: (OR) A researcher is interested in recording the number of individuals in a particular geographic region who have common cold at some point during the month of February. Which of the following measures of morbidity would be most appropriate in answering this question?: (A) Incidence, (B) Point prevalence, (C) Period prevalence, (D) None of the above
Answer is B. Point Prevalence:

It can be defined as "the number of all current cases (both old and new) of a specific disease at one point in time in relation to a defined population". 
The 'point in time' in point prevalence can be either a day or few days or even few weeks, depending upon the time taken to examine the sample of the population. 
The point prevalence is the frequency of the disease at a designated point in time.