Farmers arrive in front of the Greek parliament in Athens during their rally against pension reform, on February  12, 2016
Fears that Greece will exit the eurozone, a "Grexit", could revive if Greek authorities do not come up with "credible" reforms, notably on pensions, a senior IMF official said February 11. / AFP / LOUISA GOULIAMAKI        (Photo credit should read LOUISA GOULIAMAKI/AFP/Getty Images)