French phrase
Lequel est le plus grand ?
Meaning
Which one is the biggest?
When to use it
Asks which item has the greatest size. It compares several items and is natural in casual speech.
Example dialogue
Lequel est le plus grand ? Le ballon bleu ou le rouge ?
Which one is the biggest? The blue ball or the red one?
Le ballon rouge, je pense.
The red one, I think.