Correct Answer: A

Rationale: The most probable diagnosis is Leptospirosis. The symptoms described align with the classic presentation of Leptospirosis, such as fever, muscle pain, headache, jaundice, and hemorrhages. The initial symptoms of chills, high fever, and muscle pain followed by jaundice and hemorrhages are characteristic of Leptospirosis. The presence of dark urine and low diuresis also point towards kidney involvement, which is common in Leptospirosis due to renal failure. Additionally, the patient's history of potential exposure to contaminated water or soil supports the diagnosis, as Leptospirosis is commonly transmitted through contact with infected animal urine. Summary of other choices: - Typhoid fever typically presents with sustained fever, abdominal pain, and constipation, not matching the symptoms described. - Virus A hepatitis usually presents with jaundice, but other symptoms such as muscle pain and hemorrhages are not typical. - Sepsis is a systemic response

Correct Answer: D

Rationale: The correct answer is D: peroxisomes. Peroxisomes contain oxidative enzymes, such as catalase and peroxidase, that are capable of oxidizing toxic substances. These enzymes help detoxify harmful molecules by breaking them down into harmless products. Lysosomes (choices B and C) contain hydrolytic enzymes for breaking down cellular waste, not oxidative enzymes. Therefore, the correct choice is peroxisomes due to their specific function in detoxification through oxidation reactions.

Correct Answer: A

Rationale: Step-by-step rationale: 1. Arenaviridae family includes viruses with a segmented genome. 2. Lassa virus has a segmented genome, placing it in the Arenaviridae family. 3. Crimean-Congo hemorrhagic fever virus belongs to the Nairoviridae family, not Arenaviridae. 4. Rabies virus belongs to the Rhabdoviridae family, not Arenaviridae. 5. Epstein-Barr virus belongs to the Herpesviridae family, not Arenaviridae. Summary: A: Lassa virus is correct because it has a segmented genome, characteristic of Arenaviridae. B, C, D: Crimean-Congo hemorrhagic fever virus, Rabies virus, and Epstein-Barr virus belong to different virus families, not Arenaviridae.

Correct Answer: C

Rationale: The correct answer is C: It is non-motile and non-spore forming. Pseudomonas aeruginosa is motile due to its flagella and is non-spore forming. A is correct because it is a Gram-negative bacterium, and B is correct as it is oxidase-positive. D is incorrect because C is not true.

Correct Answer: B

Rationale: The correct answer is B: sporadic disease. Infection of several persons without any epidemiological link is considered sporadic because it occurs in a random and isolated manner, with no clear pattern or connection between cases. It is not classified as an epidemic (A) because it does not involve a sudden increase in the number of cases within a specific population. It is also not endemic (C) as endemic diseases are constantly present in a particular region or population. Lastly, it is not a pandemic (D) which refers to a global outbreak affecting a large number of people across different countries.