Yogurt is fermented with fresh milk and lactic acid bacteria. After fermentation, the original lactose in milk becomes lactic acid, which is easy to digest, so it has a sweet and sour taste, and the nutritional components are roughly the same as those of fresh milk. It is a kind of food with high nutritional value, especially suitable for middle-aged and elderly people with gastrointestinal dysfunction and lactose intolerance. It can maintain the balance of intestinal flora, promote intestinal peristalsis, improve intestinal environment, inhibit the growth and reproduction of harmful bacteria and improve human immunity.
So choose: D.