Final answer:
For someone with lactose intolerance, consuming milk and dairy products would cause intestinal distress because they are unable to properly digest lactose due to a deficiency of the enzyme lactase.
Step-by-step explanation:
Lactose intolerance is a condition characterized by the inability to properly digest lactose, which is a sugar found in milk and dairy products. When the absorptive cells of the small intestine do not produce sufficient amounts of lactase, the enzyme needed to break down lactose, individuals may experience symptoms such as abdominal cramps, bloating, and diarrhea. In the case of lactose intolerance, consuming whole grains, soy products, or leafy green vegetables would not typically cause intestinal distress. Therefore, among the options provided, milk and dairy products would cause intestinal distress for someone with lactose intolerance.