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What is 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? and explain in detail?
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.