Argentina's former President Fernando de la Rua (2nd L) pose for the media alongside Director of the Teatro Colon Dario Loperfido (L), De la Rua's wife Ines Pertine (2nd R) and Loperfido's wife Esmeralda Mitre, after arriving for a gala organised by Argentine President Mauricio Macri at the Teatro Colon (Colon Theatre) in Buenos Aires December 10, 2015. Macri took office as Argentina's first non-Peronist president in more than a decade on Thursday, promising to end policies of leftist populism and revive the South American country's ailing economy. Macri began his 4-year term in a ceremony snubbed by his predecessor, Cristina Fernandez de Kirchner, following a rancorous argument over where the handover of power should take place. REUTERS/Martin Acosta