单项选择题

M: Hi, mum! W: Ah, there you are, I was getting worried about you. It’s late. M: Yes. I bumped into Lyn and went to the pub for a drink. She was telling me about a funny thing that had happened to her yesterday. W: Oh, what was that M: Well, she was driving home from work when suddenly she saw an old lady on her hands and knees in the middle of the road. W: Oh, her hands and knees in the middle of the road M: Yes, in front of her car. She was so shocked that she stopped without warning, and the car behind crashed into hers. W: Oh! Was she hurt M: No, she wasn’t, fortunately. W: And what was the old lady doing on her hands and knees M: I’m just coming to that -- so Lyn got out of her car. Then the old lady picked up something, and walked away without saying a word. W: Well. I never! She was lucky, Lyn didn’t run her over. M: Well, yes. Then a policeman came but he didn’t believe the story. W: Oh M: Luckily there was a witness, a man waiting for the bus. He saw it all. Guess what the old lady was doing W: I haven’t the faintest idea. M: She was looking for a false tooth. W: A false tooth M: Yes, it fell out as she was crossing the road. The witness heard her mumbling, "Oh, my gold tooth." W: I don’t believe it. M: It’s true. Ask Lyn.

The mother said, "I haven’t the faintest idea." What does that mean()

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