how to display only required options in drop-down based on selected choice in previous question

how to display only required options in drop-down based on selected choice in previous question

Please let me know how to display only required options in drop-down based on selected choice in previous question

Example, If the user select India in countries, then he must view only indian states, If he select Telangana In States, He must view Hyderabad, Secunderabad, Warangal in City Question
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