Explanation

First-century Indo-Roman trade, documented in the Periplus of the Erythraean Sea and Pliny's Natural History, featured Indian exports of pepper, spikenard (nard) and tortoiseshell as major luxury items. Nutmeg is native to the Banda Islands of the Moluccas (Indonesia) and became a prominent global commodity only in the medieval period; it was not a major Indian export to Rome in the first century AD. The previously keyed answer (tortoiseshell) is therefore wrong, and the key is corrected to nutmeg.