**Core Concept**
Apoptosis, or programmed cell death, is a vital physiological process that eliminates damaged or unwanted cells from the body. It is characterized by a series of morphological changes, including cell shrinkage, chromatin condensation, and membrane blebbing. This process is distinct from necrosis, which is a form of cell death resulting from acute cellular injury or infection.

**Why the Correct Answer is Right**
The correct answer is A. Presence of inflammation. Apoptosis is typically an inflammatory-free process, as the dying cells are rapidly phagocytosed by macrophages and other immune cells, preventing the release of pro-inflammatory mediators. This contrasts with necrosis, which often triggers an inflammatory response due to the release of cellular contents and damage to surrounding tissues. The absence of inflammation is a hallmark of apoptosis, distinguishing it from other forms of cell death.

**Why Each Wrong Option is Incorrect**
**Option B:** Bleb formation is indeed a characteristic of apoptosis, as the plasma membrane of the dying cell undergoes changes that lead to the formation of membrane blebs. These blebs contain cellular organelles and are involved in the phagocytosis of apoptotic cells.
**Option C:** Eosinophilia is a characteristic of necrotic cells, not apoptotic cells. Eosinophilic staining is a result of the denaturation of cellular proteins during the necrotic process, which leads to the accumulation of acidic, eosinophilic material within the cell.
**Option D:** Cell shrinkage is a hallmark of apoptosis, as the dying cell undergoes a process of cellular condensation and shrinkage. This is accompanied by a reduction in cell volume and a characteristic "apoptotic body" morphology.

**Clinical Pearl / High-Yield Fact**
Apoptosis plays a crucial role in maintaining tissue homeostasis and preventing the development of cancer. Dysregulation of the apoptotic pathway has been implicated in various diseases, including cancer, autoimmune disorders, and neurodegenerative diseases.

✓ Correct Answer: A. Presence of inflammation.