Final answer:
a) Tamsulosin is the drug that causes floppy iris syndrome, particularly relevant in the context of cataract surgery.
Step-by-step explanation:
The drug that causes floppy iris syndrome is a) Tamsulosin. Floppy iris syndrome is a condition that can be encountered during cataract surgery in patients treated with certain medications. Tamsulosin, a drug used primarily to treat benign prostatic hyperplasia (BPH), is a selective α1 receptor antagonist that has been associated with an increased risk of this complication, making the management of the iris challenging during eye surgery. It is important for ophthalmologists to be aware of a patient’s use of tamsulosin or similar medications prior to cataract surgery due to its implications for surgical technique and potential complications.