I know which one it is
I know her name.
No sé cuál es el significado del odio.
I don't know the meaning of hate.
I don't know what their religion is.
Esa es la oficina de Mennis, no sé cuál es su domicilio.
That's Mennis's office, I don't know his address.
— Hermano 2 (2000)
No sé cuál es la respuesta correcta.
I don't know which answer is correct.
Ni siquiera sé cuál es el apellido de Tom.
I don't even know Tom's last name.
Sé cuál es el rango del soldado.
I know the soldier's rank.
No sé cuál es peor, Clodomil o Pingulim.
I don't know which is worse, Clodomil or Pingulim.
— Una segunda madre (2015)