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C. Rangarajan is recognized for his efforts and contributions related to the issue of Impact of HIV/AIDS in the Asian region, hence option 2 is the correct choice. Now, let`s break down the other options:
Option 1, `Promotion of tourism in the Asian region` is incorrect as Rangarajan is not known to be actively advocating for this.
Option 3, `Promotion of free trade in the Asian region`, again does not align with Rangarajan`s noted work, he is not known to be engaged in economic or trade policies on a Pan-Asian level.
Option 4 suggests that Rangarajan`s involvement was in `Higher technical education in the universities in the Asian region`, which is also not correct. His engagement revolve around public health issues, particularly relating to HIV/AIDS, not in higher technical education.