Final answer:
Pica is associated with low levels of iron in the blood and can lead to negative health consequences, such as gastrointestinal issues and lead poisoning.
Step-by-step explanation:
The correct answer to the question "Which of the following is true about pica?" is C. It is associated with low levels of iron in the blood. Pica is an eating disorder characterized by cravings to eat non-food items, such as dirt, clay, or laundry starch. This condition can indeed be associated with nutrient deficiencies, including iron deficiency anemia. Pica is a clinically recognized eating disorder that can lead to various negative health consequences, including gastrointestinal blockages and lead poisoning due to consuming non-food substances that may be contaminated.