Correct Answer: D

Rationale: The correct answer is D: III, IV, V. 1. RNA viruses belong to Group III of the Baltimore classification system because their genetic material is single-stranded RNA. 2. They are also categorized under Group IV as they use reverse transcriptase to replicate their genetic material. 3. Finally, RNA viruses fall under Group V as they have an envelope derived from the host cell membrane. Therefore, options A, B, and C are incorrect as they do not include all the correct groups that RNA viruses belong to according to the Baltimore classification system.

Correct Answer: A

Rationale: The correct answer is A: Tetanus. Tetanus is caused by the bacterium Clostridium tetani, which produces a neurotoxin leading to muscle stiffness, including trismus (restricted mouth opening). The patient's history of a stab wound increases the likelihood of tetanus infection due to the spores entering the body through the wound. Incorrect Choices: B: Brucellosis does not typically present with trismus and is more commonly associated with fever, joint pain, and fatigue. C: Whooping cough presents with severe coughing fits but does not cause trismus. D: Wound anaerobic infection may cause localized symptoms at the wound site but is less likely to cause trismus compared to tetanus.

Correct Answer: D

Rationale: The correct answer is D because all three choices, Clostridium botulinum, Morbillivirus morbillorum, and Clostridium tetani, can cause infections of the central nervous system (CNS). Clostridium botulinum can lead to botulism, which affects the nervous system. Morbillivirus morbillorum can cause measles, which can lead to viral encephalitis. Clostridium tetani can cause tetanus, which affects the CNS by producing neurotoxins. Therefore, all three choices are pathogens that can cause infections of the CNS.

Correct Answer: D

Rationale: The correct answer is D because the female reproductive system consists of the uterus, ovaries, vagina, and fallopian tubes. The ovaries produce eggs, the fallopian tubes transport the eggs to the uterus, where fertilization can occur. The vagina is the birth canal and where sperm is deposited during intercourse. The uterus is where a fertilized egg implants and a fetus develops. Choice A is incorrect because it includes the kidneys, which are part of the urinary system, not the reproductive system. Choice B is incorrect because it includes the bladder and duodenum, which are part of the urinary and digestive systems, respectively, not the reproductive system. Choice C is incorrect because it includes the bladder and ureter, which are part of the urinary system, not the reproductive system.

Correct Answer: A

Rationale: The correct answer is A: Trichomonas vaginalis. Trichomonas vaginalis is a sexually transmitted protozoan that causes trichomoniasis. The pear-shaped flagellated protozoa with an undulating membrane described in the question match the morphology of Trichomonas vaginalis. It is typically found in vaginal discharge of infected individuals. Giardia lamblia (B) is a different protozoan that causes giardiasis and has a distinct morphology of a teardrop shape with flagella. Trypanosoma brucei (C) causes African sleeping sickness and Leishmania donovani (D) causes visceral leishmaniasis, both of which have different morphologies and clinical presentations compared to Trichomonas vaginalis.