Which of the following pairs is not correctly matched

Answer: Option D

All the given options, like colocasia, Potato, and Yams are tubers whereas Turnip is not a tuber it is an edible root crop.
The turnip or white turnip is a root vegetable commonly grown in temperate climates worldwide for its white, fleshy taproot. As a root crop, turnips grow best in cool weather; hot temperatures cause the roots to become woody and bad-tasting.
Turnips are a biennial plant, taking two years from germination to reproduction. The root spends the first year growing and storing nutrients, and in the second year, the flowers produce seeds and die.