**Core Concept**
The question involves calculating various rates related to pulmonary tuberculosis in a primary health centre, including incidence rate, prevalence rate, and mortality rate. These rates are essential in **epidemiology** to understand the distribution and determinants of health-related events.

**Why the Correct Answer is Right**
To calculate these rates, specific data is required. The **incidence rate** can be calculated as the number of new cases (30) divided by the population at risk (average of 30,000 and 30,600), considering the time period. The **prevalence rate** at the beginning and end of the year can be calculated using the initial and final number of cases and the respective populations. However, calculating the **mortality rate** specifically due to pulmonary tuberculosis requires the number of deaths attributed to this cause, which is provided (2 deaths), but the question lacks information on the total number of deaths or the population at risk specifically for mortality rate calculation in the context of tuberculosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might seem plausible because it could relate to any of the rates mentioned, but without specifying, it's hard to directly address why it's incorrect without the actual option text.
**Option B:** Similarly, without the text, the reasoning for its incorrectness cannot be directly provided.
**Option C:** Again, lacking the specific text, the explanation for its incorrectness is not feasible.

**Clinical Pearl / High-Yield Fact**
A crucial point to remember is that **incidence rate** measures the risk of developing a disease, **prevalence** gives an idea of the disease burden at a specific time, and **mortality rate** indicates the death rate due to a specific cause. Understanding these definitions is key to solving epidemiological problems.

**Correct Answer:** D.