Which of the following is a side effect commonly associated with ACE inhibitors aside from dry cough?

Rash is a recognized side effect of ACE inhibitors, which are commonly prescribed for conditions such as hypertension and heart failure due to their ability to inhibit the angiotensin-converting enzyme. This inhibition leads to various physiological responses, one of which can include altered immune responses or skin reactions, manifesting as a rash in some patients.

The other options are less commonly associated with ACE inhibitors. Tachycardia can occur in response to various factors but is not a direct side effect of these medications. Elevated blood glucose levels are typically more associated with other classes of medications, like corticosteroids or certain antipsychotics. Weight gain is also not a usual side effect of ACE inhibitors; in fact, these drugs can sometimes lead to slight weight reduction due to their effects on fluid retention and blood pressure control. Thus, among the provided options, rash is the most appropriate choice reflecting a side effect associated with ACE inhibitors.