Ilmenite and rutile, abundantly available in certain coastal tracts of India, are rich sources of which one of the following?

Ilmenite ($FeTiO_3$) and rutile ($TiO_2$) are the primary commercial ores of Titanium, found extensively in the beach sand deposits of India's coastal states like Kerala, Odisha, and Tamil Nadu. While ilmenite contains iron, it is not a primary source of iron ore (which is typically sourced from hematite or magnetite), and aluminium is derived from bauxite. This question tests the core concept of the distribution and economic identification of strategic mineral resources in India.