For a Fibonacci sequence, from the third term, each term in the sequence is the sum of the previous two terms in that sequence. Given that in a Fibonacci sequence, the fifth term is $17$ and the sixth term is $27$. What is the first term in this Fibonacci sequence? 
选项为:A:$$1$$  B:$$2$$  C:$$3$$  D:$$4$$  E:$$5$$  请回答其中一个选项.