Mother India (1957) is the oldest film in this list, released decades before the others (Sholay-1975, Lagaan-2001, Rang De Basanti-2006, 3 Idiots-2009, Om Shanti Om-2007). It's a classic black-and-white film representing post-independence Indian cinema, while others are modern color films. The question asks for the 'odd one out' based on temporal or stylistic differences.