The Client Is Being Treated with a Thiazide Diuretic as Well

The client is being treated with a thiazide diuretic as well as digoxin. He complains to the nurse of experiencing blurred vision. The highest priority nursing intervention is to call the physician because blurred vision:

A) is indicative of digoxin toxicity.
B) is indicative of an anaphylactic reaction.
C) indicates an inadequate dosage of the diuretic.
D) indicates an overdose of the diuretic.