16. Which one of the following statement is most appropriate?
(A) Morphine can act on µ1 and µ2 opioid receptors.
(B) µ1 opioid receptor can modulate Na+ and Cl- channels via G-protein.
(C) For human adults, the intrathecal bolus dose of morphine is 3-10 mg.
(D) For human adults, the intrathecal bolus dose of morphine is 3-10 µg.