Which of the following is described as a large clot blocking the normal flow of blood to the lungs?

A. T cells: T lymphocytes are primarily involved in cell-mediated immunity and are implicated in conditions such as lymphomas and certain leukemias. Multiple myeloma does not originate from T-cell lines. The disease process specifically affects antibody-producing cells rather than cell-mediated immune cells.

B. B cells: Multiple myeloma arises from malignant transformation of B lymphocytes that have differentiated into plasma cells. These abnormal cells produce excessive amounts of a single immunoglobulin, leading to characteristic clinical features. The neoplasm is therefore classified as a disorder of the B-cell lineage.

C. Immature plasma cells: Immature plasma cells are more commonly associated with plasma cell leukemia or early precursor disorders. Multiple myeloma involves clonal proliferation of plasma cells that are typically mature rather than immature. The disease reflects abnormal antibody production rather than early cell precursors.

D. Mature red blood cells: Mature red blood cells are responsible for oxygen transport and are not involved in neoplastic immune disorders. While anemia may occur as a complication of multiple myeloma, erythrocytes are not the malignant cell type. They are affected secondarily due to marrow infiltration.

A. Blood sugar issues: Chronic pancreatitis can lead to impaired insulin production, resulting in hyperglycemia or diabetes. While this is a common complication, it is a consequence of pancreatic damage rather than a defining feature of the disease.

B. Diarrhea: Diarrhea may occur due to fat malabsorption from exocrine pancreatic insufficiency. It is a symptom but not the key indicator that distinguishes chronic pancreatitis from acute forms.

C. Irreversible damage: The hallmark of chronic pancreatitis is irreversible structural and functional damage to the pancreas. Fibrosis, calcification, and permanent loss of exocrine and endocrine function define the chronic nature of the condition and differentiate it from acute pancreatitis.

D. Malabsorption: Malabsorption occurs due to decreased pancreatic enzyme secretion and can lead to steatorrhea and nutrient deficiencies. While significant, it reflects the consequences of chronic damage rather than the defining characteristic itself.

E. Respiratory distress: This is actually a classic complication of acute pancreatitis. In severe acute cases, systemic inflammation can lead to Acute Respiratory Distress Syndrome (ARDS). While chronic patients can have lung issues, respiratory distress is not a hallmark or "key sign" for diagnosing the chronic form of the disease.