I want to know the answer to the following question:
How many subjects were judged to be the best in terms of internationally recognised research quality?
All the background I'm provided with is that "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.". Is that enough to answer the question?