The correct interrogative sentence is formed by using the auxiliary verb 'does' before the subject and the base form of the main verb.
- The structure for a 'wh-' question in the present simple tense is: Wh-word + auxiliary verb (do/does) + subject + base form of the main verb + ...?
- Applying this to the statement 'My father works in a hospital', we get 'Where does my father work?'.
Where does my father work?