**Core Concept**
The effective literacy rate is a measure of the percentage of a population that can read and write, and it is an important indicator of a country's educational and socioeconomic development. Literacy rates are calculated based on data from census surveys and other sources.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general concept. The effective literacy rate is typically calculated from the population aged 7 years and above, as this age group is considered to have completed primary education and is likely to have acquired basic reading and writing skills.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the effective literacy rate is not calculated from the entire population, including infants and young children who have not yet acquired literacy skills.
**Option B:** This option is incorrect because the effective literacy rate is not calculated solely from the male population, as it is an indicator of the overall educational level of a population.
**Option C:** This option is incorrect because the effective literacy rate is not calculated from the population below a certain age, such as 7 years, who may not have acquired literacy skills yet.

**Why Each Wrong Option is Incorrect (continued)**
**Option D:** Without the correct answer, it's challenging to provide a specific reason for this option being incorrect. However, generally, the effective literacy rate is calculated based on a specific age group, and any option that does not align with this principle would be incorrect.

**Clinical Pearl / High-Yield Fact**
The effective literacy rate is a crucial indicator of a country's educational and socioeconomic development, and it has significant implications for public health, as literate individuals are more likely to have better health outcomes and access to healthcare services.

**Correct Answer:** Correct Answer: D. Population aged 7 years and above.