In Response to a Nurse's Question About Bowel Elimination Habits

In response to a nurse's question about bowel elimination habits, a patient says, "Sometimes my bowel movements are greenish black. Is that normal?" The nurse replies:

A) "Large amounts of dairy products can cause your stools to turn green."
B) "If you take iron tablets, your stools can become greenish black."
C) "Typically our diet has very little to do with the color of our stools, so tell your physician about it."
D) "Eating green foods such as spinach can cause your stools to have greenish black streaks."