The correct answer is Life expectancy at birth.
Life expectancy at birth is a measure of the average number of years that a newborn is expected to live if current mortality rates continue to apply. It is a widely used indicator of the overall health of a population.
Infant mortality rate is the number of deaths of infants under one year of age per 1,000 live births in a given year. It is a sensitive indicator of the level of health and the quality of health care in a country.
Maternal mortality rate is the number of deaths of women from pregnancy-related causes per 100,000 live births in a given year. It is a measure of the risk of death for women associated with pregnancy and childbirth.
Disease prevalence is the proportion of a population that has a particular disease at a given time. It is a measure of the burden of disease in a population.
Of the four options, life expectancy at birth is the most comprehensive measure of health. It takes into account the risk of death from all causes, including infectious diseases, chronic diseases, and injuries. Infant mortality rate and maternal mortality rate are also important measures of health, but they focus on specific causes of death. Disease prevalence is a measure of the burden of disease, but it does not take into account the risk of death.