Forget the chalk.
So he ate some chalk, it isn't toxic, sure didn't cause the pleural effusion.
Or they didn't do it at all. Calcium carbonate's also what's in chalk.
Or they didn't do it at all. Calcium carbonate's also what's in chalk. [SEP] So he ate some chalk, it isn't toxic, sure didn't cause the pleural effusion. [SEP] Forget the chalk.