How will you decide the language to write your research paper in? What is the reason to prefer it on other languages?

if i want my paper to have wide readership, then i should go for international languages such as english. however contries which promote their own language in research are found to be more productive than other contries where english is a second language. language seems to be a problem in many third world contries

Anayat I am ashamed to say that it would have to be in English, I know no other!