Final answer:
The nurse should administer Lioresal (Baclofen) to help alleviate spasticity complications in a patient who has suffered a stroke.
Step-by-step explanation:
To alleviate spasticity complications in the lower extremity of a patient who has suffered a stroke, the appropriate medication to administer would be b. Lioresal (Baclofen). Baclofen is a muscle relaxer and an antispastic agent that is commonly used to treat muscle symptoms such as spasticity related to multiple sclerosis, spinal cord injuries, or other neurological diseases. Diphenhydramine (Benadryl) is mainly used as an antihistamine for allergies, Heparin is an anticoagulant that prevents the formation of blood clots, and Pregabalin (Lyrica) is used to treat nerve pain. Therefore, Baclofen would be the most suitable medication for this situation.