**Core Concept**
The patient's asthma exacerbation is likely triggered by the same medication used to treat glaucoma, which can cause bronchospasm and increase intraocular pressure.

**Why the Correct Answer is Right**
The likely causative agent is a beta-blocker, which is commonly used to treat glaucoma by decreasing intraocular pressure. However, beta-blockers can also cause bronchospasm and trigger asthma exacerbations due to their mechanism of action on beta-2 adrenergic receptors in the airways. This is because beta-2 receptors in the lung are responsible for bronchodilation, and blocking these receptors can lead to bronchoconstriction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because beta-blockers are the primary concern in this scenario, not other classes of medications.
**Option B:** This option is incorrect because while certain medications can cause asthma exacerbations, the specific context of glaucoma treatment and asthma exacerbation points towards beta-blockers.

**Clinical Pearl / High-Yield Fact**
A mnemonic to remember the potential side effects of beta-blockers is "B-A-D": Bronchospasm, Asthma, and Dyspnea.

**Correct Answer:** B. Beta-blockers