Carson chews on pieces of loose tar from the curbside. She spits it out before coming inside. Her mother thinks she has pica and needs psychiatric help. What do you think?

a. No, Carson would need to ingest the tar for pica. Nevertheless, Carson should speak to a doctor or dentist.
b. No, chewing tar is a cultural practice among lower-income children, which can be compared to chewing gum or smokeless tobacco.
c. Yes, chewing tar is in the same category as chewing coal and the like in the nineteenth century and is a form of pica.
d. Yes, Carson is chewing in an inedible substance.