Ms. Zhang is very beautiful, and for many years likes to wear skirts in winter to show her graceful figure. Since last winter, she felt pain in the knee joint every cold and cold day. After the doctor's diagnosis, she got arthritis. So Zhang The woman believes that wearing less on a cold day is the cause of arthritis. Which of the following, if true, would most question Ms. Zhang's point of view? ['Some young ladies in Japan like to wear skirts in winter, but they do not suffer from arthritis because they wear less on cold days.', 'Modern medical research shows that the root cause of arthritis is strain, infection or creation, and wearing cold joints on cold and cold days is prone to seizures.', "Ms. Zhang's sister and she lives in a city. For many years, she also likes to wear skirts in winter, but she does not have arthritis.", 'Many people who wear more on cold days also have arthritis, and most of them are middle-aged and elderly.']