The 'Red Fort' in Delhi, built by Shah Jahan, primarily used _____ as its construction material.
- red sandstone
- marble
- granite
- brick
Answer: red sandstone
Red Fort (Lal Qila, completed 1648) is built primarily of red sandstone with marble inlays. Designed by Ustad Ahmad Lahori, it exemplifies Mughal architecture and is a UNESCO World Heritage Site.