Consider the following cell types : 1. Monocyte 2. Chondrocyte 3. Basophil 4. Lymphocyte How many of the above belong to animal cell types ?

All four cell types listed are specialized cells found in animal organisms:

• Monocytes: These are a type of leukocyte (white blood cell) that circulate in the blood and migrate into tissues to become macrophages or dendritic cells, forming a vital part of the animal immune system.
• Chondrocytes: These are the only cells found in healthy cartilage. They produce and maintain the cartilaginous matrix, which is a connective tissue found in animals.
• Basophils: These are a type of granulocyte (white blood cell) involved in inflammatory and allergic responses in animals.
• Lymphocytes: These include T cells, B cells, and natural killer cells, which are fundamental to the adaptive and innate immune systems of vertebrates.

Since all four are distinct animal cell types, the correct answer is Option D.