B 
Find the integer part of the following fractional expression:  $$ \frac{1}{\frac{1}{50}+\frac{1}{51} +\frac{1}{52} +\frac{1}{53} +\frac{1}{54}} $$ 
Options:
- $$1$$ 
- $$10$$ 
- $$20$$ 
- $$50$$ 
- None of the above 