Read the following premise and answer if the hypothesis is true.
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 is married to a taxi driver.. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
It's impossible to say
It's impossible to say.