Which of the following is NOT an authorized prescriber with the ability to write a prescription?

As the TLB of a substance decreases, _____.

a. Toxicity increases b. Toxicity decreases c. Test interval duration increases d. Allowable exposure decreases

From the following list, select the drugs associated with intrinsic tooth staining in children younger than 8 years of age

a. metronidazole b. doxycycline c. erythromycin d. clarithromycin e. tetracycline f. minocycline