A key health indicator where Meghalaya faces challenges is:

Infant and maternal mortality
Life expectancy
Obesity rates
Prevalence of rare diseases

The correct answer is: a) Infant and maternal mortality.

Infant mortality is the death of an infant under one year of age. Maternal mortality is the death of a woman due to pregnancy or childbirth. Both infant and maternal mortality are considered key health indicators because they reflect the overall health of a population.

Meghalaya is a state in northeastern India with a population of over 3 million people. The state has a high rate of infant mortality, with 43 deaths per 1,000 live births. This is significantly higher than the national average of 30 deaths per 1,000 live births. The high rate of infant mortality in Meghalaya is due to a number of factors, including poverty, lack of access to healthcare, and poor nutrition.

Maternal mortality is also a major problem in Meghalaya. The state has a maternal mortality rate of 200 deaths per 100,000 live births. This is more than three times the national average of 67 deaths per 100,000 live births. The high rate of maternal mortality in Meghalaya is due to a number of factors, including lack of access to healthcare, poor nutrition, and traditional practices that put women at risk during pregnancy and childbirth.

The government of Meghalaya is working to improve the health of its population. The state has launched a number of initiatives to reduce infant and maternal mortality, including improving access to healthcare, providing nutrition supplements to pregnant women, and training midwives. These initiatives are having a positive impact, but there is still much work to be done.

The other options are not as important as infant and maternal mortality. Life expectancy is the average number of years that a person is expected to live. Obesity rates are the percentage of people who are obese. Prevalence of rare diseases is the number of people who have a rare disease. These are all important health indicators, but they are not as important as infant and maternal mortality.