Step 1: Understanding the Concept:
Some cells have the ability to divide throughout life.
These cells are important for tissue regeneration.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand the properties of stem cells.
Step 3: Detailed Explanation:
Stem cells retain their proliferative capacity throughout life.
They can self-renew and differentiate into various cell types.
Primary, secondary, and tertiary cell cultures are from cells that have limited lifespan.
Thus, stem cells are the cells that retain proliferative capacity.
Step 4: Final Answer:
Stem cells retain their proliferative capacity throughout life.
Hence, the correct option is (C).