India''s only National Political Party whose symbol remains unchanged

QUESTION - 

Before the elections to India's first Lok Sabha, back in 1951, the Election Commission of India (as it still does) released a list of approved elections symbols for different political parties.

These were 14 political party election symbols are indicative of how much Indian politics has changed over the last six decades.

Which is the only National Political Party whose symbol remains unchanged ?

 ANSWER - 

 Communist Part of India (CPI) is the only national party whose symbol (Ears of corn and sickle) remains unchanged.