Chlamydiosis is also known as psittacosis. Which option lists the disease synonym most accurately?

• A. Chlamydiosis
• B. Avian influenza
• C. Newcastle disease
• D. Psittacosis

Answer: (D)

This question tests recognizing that diseases can have more than one name, and which name is commonly used as the alternate label. The infection caused by Chlamydia psittaci is typically called psittacosis in clinical and public health contexts, even though veterinary literature might also use chlamydiosis. The term psittacosis is the synonym that most accurately maps to the disease described by chlamydiosis, which is why it is the best choice here. The other terms refer to different diseases (avian influenza and Newcastle disease) or simply restate the same disease name in a less common context, so they don’t serve as the correct synonym in this framing.