In A Large Saucepan, Saute The Carrot, Onion And Celery In Butter Until Tender. Stir In Flour Until Blended. Gradually Stir In Broth. Add The Rice, Chicken, Salt, Pepper And Garlic Powder; Bring To A Boil. Reduce Heat; Cover And Simmer For 10-15 Minutes Or Until Vegetables Are Tender. Reduce Heat To Low. Stir In The Milk, Lemon Juice And Wine If Desired. Cook And Stir For 5 Minutes Or Until Heated Through.