In indirect questions, qué is placed in front of a noun meaning "what/which [noun]". Have a look at the following examples:
No sé qué coche voy a comprar.I don't know which car I am going to buy.
Dime qué casa te gusta más.Tell me which house you like the most.
Tienes que decidir qué vestidos vas a donar.You have to decide which dresses you are going to donate.
No saben qué faldas son las más baratas.They don't know which skirts are the cheapest.
Qué will always have a written accent in these cases. Notice how qué doesn't change, no matter if the noun is masculine, feminine, singular, or plural.
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