Total RBC for men?

Correct Answer: B

Rationale: The correct answer is B (4.6-6.0) because it represents the normal range for total Red Blood Cell (RBC) count in men, typically measured in millions per microliter. RBC count outside this range may indicate anemia or other health issues. Choice A (4.0-5.0) is too narrow and may miss slightly elevated RBC levels. Choice C (4.2-6.5) is too wide and includes values above the normal range. Choice D (4.0-6.0) is broader and includes lower values not typically seen in healthy men.

Correct Answer: B

Rationale: Step-by-step rationale: 1. Aplastic anemia is a rare disorder characterized by bone marrow failure. 2. While some drugs can cause bone marrow suppression, the mentioned drugs are not typically associated with aplastic anemia. 3. Lithium is linked to neutropenia, acetazolamide to aplastic anemia in rare cases, and aspirin to thrombocytopenia, not aplastic anemia. 4. Therefore, the correct answer is B: FALSE. Summary: - Choice A is incorrect because the drugs listed do not commonly induce aplastic anemia. - Choice C is incorrect as there is limited evidence supporting these drugs as common causes. - Choice D is incorrect as aplastic anemia induced by these drugs is not considered rare.

Correct Answer: B

Rationale: The correct answer is B: Chemotherapy. In Rai stage II of chronic lymphocytic leukemia (CLL), chemotherapy is the conventional treatment to reduce cancer cells and prevent progression. Antibiotics (choice A) are not the primary treatment for CLL. Antivirals (choice C) are used for viral infections, not CLL. Rest (choice D) alone is not sufficient to treat CLL and may lead to disease progression. Chemotherapy targets cancer cells, making it the appropriate treatment for Rai stage II CLL.

Correct Answer: A

Rationale: The correct answer is A: 70% alcohol or lens cleaner. Alcohol is recommended as it effectively removes oil without damaging the lens. Step 1: Apply alcohol on a clean cloth. Step 2: Gently wipe the lens in a circular motion. Alcohol evaporates quickly, leaving no residue. Xylene (B) is too harsh and can damage the lens. Water (C) can cause streaks and not effectively remove oil. Benzene (D) is toxic and should never be used on optical lenses.

Correct Answer: D

Rationale: Step 1: The Medullary Phase starts in the 6th week of gestation. Step 2: Hematopoiesis starts in the yolk sac and then moves to the liver, spleen, and bone marrow. Step 3: The clavicle is the first bone to show hematopoietic activity during this phase due to its unique development timeline. Step 4: Other choices like the femur, iliac crest, and skull develop hematopoietic activity later in fetal development. Summary: The clavicle is the correct answer as it is the first bone to exhibit hematopoietic activity during the Medullary Phase, while the other choices develop this activity later in the developmental process.