**Question:** True regarding anaemia of chronic diseases (ACD) are A/E -

A. Increased destruction of red blood cells
B. Decreased production of red blood cells
C. Both A and B
D. None of the above

**Core Concept:**
Anaemia of chronic diseases (ACD) is a type of anemia characterized by a decrease in hemoglobin and red blood cell count. This condition is commonly observed in patients with chronic inflammatory disorders, such as rheumatoid arthritis, chronic obstructive pulmonary disease (COPD), and infections. Chronic inflammation leads to a cascade of events, including:

**Why the Correct Answer is Right:**
In ACD, the primary cause of anemia is not increased destruction of red blood cells (option A) or decreased production of red blood cells (option B). Instead, the correct answer (option C) highlights that ACD is characterized by both increased destruction and decreased production of red blood cells.

**Why Each Wrong Option is Incorrect:**
Option A (increased destruction) is incorrect because ACD does not typically involve direct hemolysis or increased destruction of red blood cells. Instead, the increased destruction is attributed to the increased clearance of red blood cells by the reticuloendothelial system (RES), mainly in the spleen.

Option B (decreased production) is also incorrect because ACD does not typically cause primary bone marrow failure. Instead, the decreased production is a consequence of the negative feedback loop between erythropoietin and inflammation. Elevated erythropoietin levels in chronic inflammation suppresses erythropoiesis, leading to decreased red blood cell production.

Option D (None of the above) is also incorrect because option C (increased destruction and decreased production) accurately represents the pathophysiology of ACD.

**Clinical Pearl:**
Understanding the pathophysiology of ACD is crucial in diagnosing and managing patients with anemia. In clinical practice, ACD can be distinguished from other types of anemia (e.g., haemolytic anaemia or aplastic anaemia) based on the patient's history, physical examination, and laboratory findings.

**Core Concept:**
A/E stands for "anemia of inflammation" or "anaemia of chronic disease." It is a subtype of anemia that occurs as a consequence of chronic inflammatory processes, such as autoimmune disorders or infections. A/E is characterized by a normal or even increased erythropoietin level, despite the presence of low hemoglobin and/or low hematocrit.

**Why the Correct Answer is Right:**
In ACD, the primary cause of anemia is the combined effect of increased erythropoietin level and inflammation. Erythropoietin is a hormone produced by the kidneys and stimulates the production of red blood cells in the bone marrow. Inflammatory cytokines released during chronic inflammation suppress the production of erythropoietin, leading to a decrease in red blood cell production and subsequently low hemoglobin and hematocrit levels.

**Why Each Wrong Option is Incorrect:**
Option A (increased destruction) and Option B (decreased production) are incorrect because A/E is characterized