Final answer:
Nystatin (Mycostatin) would be the appropriate medication for treating a patient with thrush (an oropharyngeal candidiasis).
Step-by-step explanation:
The appropriate medication for treating a patient with thrush (an oropharyngeal candidiasis) would be Nystatin (Mycostatin). Nystatin is commonly used as a topical treatment for yeast infections of the skin, mouth, and vagina. It is effective in eliminating the Candida fungus that causes thrush.