Cai Mingjie (蔡明杰, born 1952) is a Singaporean taxicab driver and former biology researcher, known for his blog, "A Singapore Taxi Driver's Diary". He is described variously as "Singapore's most educated taxi driver" and "the only taxi driver with a Ph.D.".

Can we draw the following conclusion?
Cai Mingjie has A B.S. in Biology.
It's impossible to say