The 2008 Research Assessment Exercise returned 26% of the 1225 staff submitted as being world-leading (4*) and a further 47% as being internationally excellent (3*). The 2008 Research Assessment Exercise also showed five subjects Pure Mathematics, Epidemiology and Public Health, Chemical Engineering, Civil Engineering, and Mechanical, Aeronautical and Manufacturing Engineering were assessed to be the best[clarification needed] in terms of the proportion of internationally recognised research quality.
Try to answer this question if possible (otherwise reply "unanswerable"): What five subjects where shown to the top ranked in the world?
unanswerable