What does the idiom "White elephant" mean?

• Correct Answer: গ) A useless but costly possession.

White elephant
- Bangla Meaning: অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা।
- English Meaning: something that is expensive, or that costs a lot of money to keep in good condition, but that has no useful purpose and is no longer wanted.

Examples:
- The new office block has become an expensive white elephant.
- The dam has become something of a white elephant.

Source: Merriam-Webster Dictionary, Accessible Dictionary, Cambridge Dictionary.