Question

For which of these people would you not use tú?

1. Paula
2. Claudia
3. Raúl
4. Dr. Ramos

Answer 1

4. Dr. Ramos

Step-by-step explanation:

Tú is informal, so it is to be used casually, and doesn't indicate any formality. Due to Dr. Ramos's title of "Dr." we are to use the formal "you" version, which is usted.