London United States biggest MBBS college 

Could you clarify what you mean by “London United States biggest MBBS college” — do you mean:

1. London, UK — medical college in London?
2. United States — medical school (“MBBS” isn’t used in the US, they award MD / DO)
3. Which measure of “biggest” — by number of students, reputation, or research funding

If you meant in London, UK, some top medical schools are:

• Imperial College London
• University College London (UCL)
• King’s College London

Let me know which you meant, and I can give a more precise answer.