Test fishing

One student recently came in to go over a tricky multiple-choice midterm with me. We discussed why her answer on a certain question ("Which of the following provides an operational definition of the concept hunger?") was wrong, and why another answer was right. After some explanation, she said, "I understand why the answer I put was completely wrong, and why this answer is clearly right, but I still think I should get partial credit." So... for being completely wrong you want... to be graded as partially right?