German phrase
Welcher ~ und welche ~ sind erforderlich?
Meaning
Which ___ and which ___ are required?
When to use it
Asks which items are needed. It is a polite, formal question.
Example dialogue
WelcherAufenthaltstitelund welcheVersicherungsind erforderlich?
Which residence permit and which insurance are required?
Für ein Studium benötigen Sie einen Aufenthaltstitel und eine Auslandskrankenversicherung.
For studying, you need a residence permit and overseas health insurance.