premise: 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.".
hypothesis: Cai Mingjie went to college.
reason: He is known as the "the only taxi driver with a Ph.D." so he must have went to college. It might have been difficult because it requires inference. 