Q. A 32-year-old man with a confirmed diagnosis of HIV presents to your clinic for a routine follow-up. His current CD4 count is below 150 cells/mm³. You consider prophylaxis for opportunistic Infections with Pneumocystis jirovecii. The patient has a documented allergy to sulfa drugs. What is the most appropriate prophylactic regimen for Pneumocystis pneumonia (PCP) in this patient with a sulfa allergy?