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What is the amount of sodium chloride salt in milligrams to be added to the following ophthalmic preparation to make it isotonic?

Naphazoline hydrochloride 1%
Sodium chloride salt qs to make solution isotonic
Sterile water qs ad 30 mL
Sodium chloride equivalent for naphazoline is 0.27

a.

0.27g

b.

0.25g

c.

0.20g

d.

0.19g

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