Correct Answer: A

Rationale: Utilizing communication and social media responsibly is an indicator that models personal and professional behavior and values. Responsible use of communication and social media demonstrates a commitment to maintaining a positive online presence, interacting respectfully with others, and upholding professional standards in digital communication. This behavior reflects integrity, accountability, and respect for oneself and others, which are essential qualities in both personal and professional settings. Additionally, demonstrating responsible behavior in the digital sphere can help build trust, enhance reputation, and foster valuable relationships with colleagues, clients, and the community.

Correct Answer: D

Rationale: Prinzmetal's angina, also known as variant angina, is characterized by episodes of chest pain that occur at rest and are relieved by nitroglycerin. Patients with Prinzmetal's angina may also have transient ST-segment elevation on an electrocardiogram (ECG) during episodes of chest pain. This is due to coronary artery vasospasm, which causes temporary obstruction of blood flow to the heart muscle. Stable angina typically presents with chest pain on exertion that resolves with rest, while unstable angina and acute myocardial infarction present with chest pain that is not relieved with nitroglycerin and are associated with more severe coronary artery disease.

Correct Answer: C

Rationale: Ciprofloxacin is an antibiotic commonly prescribed for the prevention of bacterial infections that can result from animal bites, such as dog bites. Dog bites are often contaminated with bacteria and can lead to infections, particularly from organisms such as Pasteurella multocida. Ciprofloxacin is effective against a broad range of bacteria, including those commonly found in animal bites, making it a suitable choice for infection prophylaxis in this scenario. Ibuprofen is a pain reliever and anti-inflammatory medication, tetanus toxoid is given to prevent tetanus infection, and meperidine is a narcotic analgesic used for pain relief, but none of these options specifically target bacterial prevention in the case of a dog bite.

Correct Answer: A

Rationale: Immunological memory is primarily maintained by the clonal expansion of memory B cells. Memory B cells are a type of long-lived immune cell that originates from previously activated B cells during an immune response to a pathogen. When the immune system encounters the same pathogen again, memory B cells can quickly recognize and respond to it by undergoing rapid clonal expansion and differentiation into plasma cells that produce specific antibodies. This quick and robust response leads to the more efficient elimination of the pathogen during secondary exposure, resulting in the faster and stronger immune response characteristic of immunological memory.

Correct Answer: B

Rationale: Disseminated intravascular coagulation (DIC) is a condition characterized by widespread activation of coagulation leading to both thrombosis and hemorrhage. In patients with chronic liver disease, especially in the setting of advanced cirrhosis, DIC can develop due to factors such as decreased synthesis of coagulation factors and impaired clearance of activated clotting factors. The patient in this scenario presents with signs of both abnormal bleeding (bruising, petechiae, mucosal bleeding) and laboratory findings consistent with DIC, including prolonged prothrombin time (PT) and activated partial thromboplastin time (aPTT) along with decreased platelet count.