Explanation:

The sex ratio is a demographic indicator defined as the number of females per $1000$ males in a given population. A sex ratio above $1000$ indicates more females than males. \nOption A, 'Chandigarh', is incorrect. According to the $2011$ Census, Chandigarh had a sex ratio of $818$ females per $1000$ males, indicating a significant deficit of females. \nOption B, 'Delhi', is incorrect. The National Capital Territory of Delhi had a sex ratio of $868$ females per $1000$ males in $2011$, also showing fewer females than males. \nOption C, 'Lakshadweep', is incorrect. Lakshadweep had a sex ratio of $946$ females per $1000$ males in $2011$, which is higher than Chandigarh and Delhi but still below $1000$. \nOption D, 'Puducherry', is the correct answer. According to the $2011$ Census, Puducherry (formerly Pondicherry) had a sex ratio of $1037$ females per $1000$ males. This indicates that Puducherry is one of the few regions in India, including some states and Union Territories, where the number of females exceeds the number of males, reflecting a more balanced or even female-dominant demographic structure.