Explanation: The question revolves around three statements related to Goa, a state in India. Let's break down each statement and analyze its validity.
1. **Malaria-free status and prevention of re-introduction**: The National Strategic Plan (NSP) for Malaria in India aims to maintain malaria-free status in areas where transmission has been interrupted and prevent the re-introduction of malaria through strengthened surveillance. Goa has been successful in interrupting malaria transmission and is considered a malaria-free area. Therefore, the first statement is true.
2. **Capital of Goa**: The capital of Goa is Panaji. This is a well-established fact and is true. Panaji is the administrative and legislative capital of Goa, while Vasco da Gama serves as the commercial capital.
3. **Largest state of India**: Goa is not the largest state in India. In terms of area, Goa is one of the smallest states in India. The largest state in India by area is Rajasthan, followed by Madhya Pradesh, Maharashtra, and others. Therefore, the third statement is false.
The question asks which of the statements are true. Based on the analysis, Statements 1 and 2 are true, while Statement 3 is false. Therefore, the correct answer is Option A: Only 1, 2.
Understanding the context of Goa's public health achievements, its administrative structure, and its geographical position in India is crucial for answering such questions accurately. This knowledge is often tested in competitive examinations to assess the candidate's awareness of state-specific facts and public health initiatives.