How much zinc oxide powder and petroleum jelly are needed to prepare 80 g of a 2.5% zinc oxide ointment?
A) 2.5 g zinc oxide, 97.5 g petroleum jelly
B) 2 g zinc oxide, 98 g petroleum jelly
C) 2 g zinc oxide, 78 g petroleum jelly
D) 2.5 g zinc oxide, 77.5 g petroleum jelly
Correct Answer:
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