Find the integer part of the following fractional expression:  $$ \frac{1}{\frac{1}{50}+\frac{1}{51} +\frac{1}{52} +\frac{1}{53} +\frac{1}{54}} $$ 
选项为:A:$$1$$  B:$$10$$  C:$$20$$  D:$$50$$  E:None of the above  请回答其中一个选项.