The vitamin that prevents scurvy is

Correct Answer: C

Rationale: Vitamin C (ascorbic acid) prevents scurvy by aiding collagen synthesis, essential for connective tissue. 'Vitamin C,' is correct, per nutrition texts like Shils, reversing symptoms like bleeding gums. 'Vitamin A,' supports vision. 'Vitamin B,' is a group, none specific to scurvy. 'Vitamin D,' aids bone health. Vitamin C's historical link to scurvy prevention, notably in sailors, makes C the accurate answer.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Staining techniques identify microbes by dye interaction. 'Positive,' is correct as the exception, not a technique, per microbiology (e.g., Tortora). 'Gram,' differentiates bacteria. 'Acid fast,' detects mycobacteria. 'Negative,' stains background. Positive's lack of specificity makes D the precise answer.

Correct Answer: D

Rationale: Microbial identification uses traits and reactions. 'Sterilization,' is correct as the exception, killing microbes, not identifying, per microbiology (e.g., Murray). 'Morphology,' examines shape. 'Biochemical tests,' assess metabolism. 'Serological tests,' detect antigens. Sterilization's purpose makes D the accurate answer.