Correct Answer: A

Rationale: Step-by-step rationale: 1. Metronidazole is a synthetic antiprotozoal drug commonly used for wound infection prevention. 2. It is highly effective against Helicobacter pylori, a bacterium that causes stomach ulcers. 3. Metronidazole works by disrupting DNA structure in bacteria, leading to their death. 4. Chingamin (Chloroquine) is an antimalarial drug, not effective against Helicobacter pylori. 5. Doxycycline hydrochloride is an antibiotic used for bacterial infections, not specifically for H. pylori. 6. Aciclovir is an antiviral drug used for herpes infections, not effective against H. pylori. Summary: Metronidazole is the correct answer as it is specifically effective against H. pylori and commonly used for wound infection prevention. Other choices are incorrect as they target different types of infections.

Correct Answer: A

Rationale: Step 1: Legionellosis is caused by the Legionella bacteria. Step 2: Legionellosis has two main clinical forms - Legionnaires disease and Pontiac fever. Step 3: Legionnaires disease presents with severe pneumonia symptoms, while Pontiac fever is a milder flu-like illness. Step 4: Therefore, the correct answer is A: Legionnaires disease and Pontiac fever. Summary: - Choice B (Skin and intestinal form) is incorrect as Legionellosis primarily affects the lungs. - Choice C (Lymphatic, lung, and intestinal forms) is incorrect as it does not accurately represent the clinical forms of Legionellosis. - Choice D (None of the above) is incorrect as Legionellosis does have specific clinical forms.

Correct Answer: B

Rationale: The correct answer is B: Fluconazole. Rationale: 1. Candidiasis is a fungal infection, so an antimycotic agent is needed. 2. β-lactam antibiotics like ampicillin can lead to fungal overgrowth, necessitating an antimycotic. 3. Fluconazole is an antifungal agent effective against Candida species. 4. Streptomycin is an antibiotic, not an antifungal. 5. Phthalylsulfathiazole is an antibacterial sulfonamide, not an antifungal. 6. Ampicillin is an antibiotic, not an antifungal.

Correct Answer: A

Rationale: Step-by-step rationale: 1. Metronidazole is a synthetic antiprotozoal drug commonly used for wound infection prevention. 2. It is highly effective against Helicobacter pylori, a bacterium that causes stomach ulcers. 3. Metronidazole works by disrupting DNA structure in bacteria, leading to their death. 4. Chingamin (Chloroquine) is an antimalarial drug, not effective against Helicobacter pylori. 5. Doxycycline hydrochloride is an antibiotic used for bacterial infections, not specifically for H. pylori. 6. Aciclovir is an antiviral drug used for herpes infections, not effective against H. pylori. Summary: Metronidazole is the correct answer as it is specifically effective against H. pylori and commonly used for wound infection prevention. Other choices are incorrect as they target different types of infections.

Correct Answer: A

Rationale: The most probable diagnosis is Dermatotropic leishmaniasis. The roundish ulcers, lymph node enlargement, and presence of unicellular aflagellar organisms in discharge are characteristic of this parasitic infection transmitted by sandfly bites. Leishmania parasites cause skin lesions and lymphadenopathy. Toxoplasmosis (B) presents with flu-like symptoms, not ulcers. Scabies (C) causes intense itching and burrows, not ulcers. Trypanosomiasis (D) presents with fever, not ulcers. In this case, the symptoms align closely with Dermatotropic leishmaniasis, making it the most likely diagnosis.