Identify a true statement about opioid antitussives.
A. Opioid antitussives are used to treat the underlying cause of the irritation associated with a cough.
B. Opioid antitussives are considered to be more potent analgesics than morphine.
C. Opioid antitussives possess a higher addiction liability than morphine.
D. Opioid antitussives have a direct inhibiting effect on the coughing center in the medulla.
Answer: D
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