**Question:** Trousseau's sign and chovstek's signs are positive in:

A. Rheumatoid arthritis
B. Infections
C. Hypothyroidism
D. Nephritic syndrome

**Correct Answer:** C. Hypothyroidism

**Core Concept:**
Trousseau's sign and Chovstek's sign are clinical signs used in diagnosing certain medical conditions. Both are positive in cases where there is increased vascular permeability, which leads to fluid accumulation in body tissues and organs.

**Why the Correct Answer is Right:**
Trousseau's sign and Chovstek's sign are positive in hypothyroidism because it is characterized by a deficiency of thyroid hormones. Hypothyroidism results in decreased protein synthesis, leading to reduced plasma protein concentration. This reduced protein concentration increases vascular permeability, causing fluid accumulation in the tissues and organs. Consequently, these signs indicate increased vascular permeability and fluid accumulation, which are not present in the other options.

**Why Each Wrong Option is Incorrect:**
A. Rheumatoid arthritis (RA) is an autoimmune disease characterized by synovial inflammation and joint pain. Although RA can cause joint swelling and increased vascular permeability, it is not associated with positive Trousseau's sign or Chovstek's sign due to its specific joint involvement and lack of generalized fluid accumulation.

B. Infections are characterized by an acute inflammatory response and increased vascular permeability. However, positive Trousseau's sign or Chovstek's sign is not specific to infections and can also be present in other conditions like hypothyroidism, nephritic syndrome, and certain malignancies.

D. Nephritic syndrome is a kidney disease characterized by high blood pressure, proteinuria, and hematuria. Although nephritic syndrome causes increased vascular permeability, it is not associated with positive Trousseau's sign or Chovstek's sign due to its specific renal involvement and lack of generalized fluid accumulation.

**Clinical Pearl:**
Trousseau's sign and Chovstek's sign are positive in hypothyroidism as they indicate increased vascular permeability and generalized fluid accumulation due to reduced protein synthesis and plasma volume expansion. These signs help differentiate hypothyroidism from other conditions with similar symptoms and are useful in guiding the clinical diagnosis and treatment plan.