**Question:** Which of the following type of leukemia is associated with autoimmune haemolytic anemia?

A. Acute Lymphoblastic Leukemia (ALL)
B. Acute Myeloid Leukemia (AML)
C. Chronic Lymphocytic Leukemia (CLL)
D. Chronic Myeloid Leukemia (CML)

**Correct Answer: Acute Myeloid Leukemia (AML)**

**Core Concept:** Autoimmune haemolytic anemia is a condition where the body's immune system mistakenly attacks and destroys red blood cells, leading to a decrease in red blood cells and anemia. In the context of leukemia, autoimmune haemolytic anemia can occur when the leukemic cells interfere with the normal functioning of the immune system.

**Why the Correct Answer is Right:** Autoimmune haemolytic anemia can be associated with some types of leukemia, particularly myeloid leukemias. Among the options provided, Acute Myeloid Leukemia (AML) is the correct answer because it is a type of leukemia characterized by an excessive production of immature myeloid cells in the bone marrow, which can lead to the formation of autoimmune responses against red blood cells, resulting in autoimmune haemolytic anemia.

**Why Each Wrong Option is Incorrect:**

**A. Acute Lymphoblastic Leukemia (ALL)**: ALL is a type of leukemia characterized by the excessive production of immature lymphoid cells in the bone marrow. While it can cause cytopenias and haemolytic anaemia, it is less commonly associated with autoimmune haemolytic anemia compared to AML.

**B. Chronic Lymphocytic Leukemia (CLL)**: CLL is characterized by the excessive production of mature lymphocytes in the blood and lymph nodes. Although it can cause cytopenias and haemolytic anaemia, autoimmune haemolytic anemia is less commonly associated with CLL compared to AML.

**C. Chronic Myeloid Leukemia (CML): CML** is characterized by the presence of the Philadelphia chromosome, which leads to the overproduction of myeloid cells. While it can cause cytopenias, autoimmune haemolytic anemia due to CML is even less common than in AML or CLL.

**Clinical Pearl:** Autoimmune haemolytic anaemia should be considered in patients presenting with unexplained haemolytic anaemia, especially those with a history of leukaemia. In such cases, a thorough examination of peripheral blood smear, bone marrow biopsy, and appropriate investigations, including direct Coombs test and reticulocyte count, can help confirm the diagnosis.