(ANSA) - TRIESTE, 25 OTT - Polls opened in Serbia on Sunday in what is set to be its most fiercely contested parliamentary election in more than 14 years, as a student-led movement seeks to oust the party of veteran leader Aleksandar Vucic, Serbian Progressive Party (SNS). Roughly 6.5 million eligible voters are called to the polls in a snap parliamentary election to choose lawmakers for a four-year term. (ANSA).