Which of the following statements is not consistent with primary lactose intolerance? a primary lactose intolerance is more common in some ethnic groups. b primary lactose intolerance is often seen in crohn's disease. c symptoms of primary lactose intolerance include gas, bloating, and diarrhea. d diarrhea is caused by the osmotic effect of lactose in the large intestine .e it can be treated by adding enzymes to the diet?