It's impossible to give a precise "top 5" without access to UCLA's internal enrollment data. However, fields frequently cited as strong and popular at UCLA that would likely contribute heavily to a top 5 list (if one were created) include:
1. Economics: UCLA has a highly regarded economics department attracting many students.
2. Business Administration (Anderson School): A highly competitive and prestigious business school consistently draws a large number of undergraduates and graduates.
3. Political Science: A popular and highly ranked department attracting many students.
4. Psychology: UCLA's psychology department is renowned, attracting a large number of students interested in research and clinical work.
5. Engineering (various specializations): Engineering encompasses many sub-disciplines, and collectively, they represent a massive portion of UCLA's student body. Specific branches like Computer Science and Bioengineering are exceptionally popular.
It's crucial to remember this is an informed *estimation* based on general knowledge and reputation. The precise ranking would depend on UCLA's internal data and the specific year considered. To get precise figures, you'd need to consult UCLA's official enrollment reports.