**Question:** About scurvy, true A/E:

A. Vitamin C deficiency
B. Decreased collagen synthesis
C. Increased collagen breakdown
D. Improved with antibiotics

**Core Concept:**

Scurvy is a disease caused by vitamin C deficiency, which is essential for collagen synthesis and maintenance of connective tissue integrity. Collagen is a structural protein found in connective tissues, blood vessels, and bones. It plays a crucial role in wound healing, blood vessel formation, and maintaining the integrity of blood vessels. Vitamin C is an essential co-factor for hydroxylation of proline and lysine residues in procollagen, a prerequisite for collagen synthesis.

**Why the Correct Answer is Right:**

A. Vitamin C deficiency (Answer A) is the correct A/E for scurvy because it directly relates to the pathogenesis of the disease. Vitamin C is vital for hydroxylation of proline and lysine residues in procollagen, which is necessary for collagen synthesis.

B. Decreased collagen synthesis (Answer B) is also relevant, as it is a consequence of vitamin C deficiency. Collagen synthesis is impaired, leading to the characteristic signs and symptoms of scurvy.

C. Increased collagen breakdown (Answer C) is not the true A/E for scurvy. While collagen breakdown may occur in later stages of scurvy, the primary cause is vitamin C deficiency, which impacts collagen synthesis, not breakdown.

D. Improved with antibiotics (Answer D) is incorrect because scurvy is primarily caused by a deficiency of vitamin C, not an infection. Antibiotics are used to treat bacterial infections, not address the underlying cause of scurvy.

**Why Each Wrong Option is Incorrect:**

A. Vitamin C deficiency (Answer A) is not correct because it does not address the primary cause of scurvy. Scurvy results from a deficiency in the essential vitamin C, which is crucial for collagen synthesis.

B. Decreased collagen synthesis (Answer B) may be a consequence of vitamin C deficiency but does not directly address the disease's etiology.

C. Increased collagen breakdown (Answer C) is not the primary cause of scurvy. While collagen breakdown may occur in later stages, it is the deficiency of vitamin C that leads to the disease.

D. Improved with antibiotics (Answer D) is incorrect because scurvy is caused by a lack of vitamin C, not an infection. Antibiotics are used to treat bacterial infections, not address the deficiency responsible for scurvy.

**Clinical Pearls and High-Yield Facts:**

1. Vitamin C (ascorbic acid) is an essential nutrient required for collagen synthesis, which is crucial for wound healing, bone growth, and the maintenance of connective tissue integrity.
2. Scurvy was historically more common among sailors, leading to the term "sailor's disease" or "sailor's gum disease."
3. Symptoms of scurvy include gum inflammation, bleeding gums, bruising, joint pain, and fatigue