Given the question: Read the following article and select the best answer. Article: A little old man and his wife walked slowly into McDonald's on a cold winter evening. They took a table near the back wall, and then the little old man walked to the cash register to order. After a while he got the food back and they began to open it. There was one hamburger, some French fries and one drink. The little old man carefully cut the hamburger in half and divided the French fries in two piles. Then he neatly put the half of the food in front of his wife. He took a sip of the drink and his wife _ . "how poor the old people are!" the people around them thought. As the man began to eat his hamburger and his French fries, his wife sat there watching him and took turns to drink. A young man came over and offered to buy another meal for them. But they refused politely and said that they got used to sharing everything. Then a young lady asked a question of the little old lady. " Madam, why aren't you eating? You said that you share everything, then what are you waiting for?" She answered, "The teeth." Question: What can we know from the whole passage? - The old lady wasn't hungry at all. - The two old people shared the same teeth. - The old lady had a toothache. - They are very friendly.
The answer is:
The two old people shared the same teeth.