'Lasso'' is a structure found in
(a) Nutritive muscular cell
(b) Epitheliomuscular cell
(c) Sensory cells
(d) Nematoblasts

Options

A. Nutritive muscular cell
B. Epitheliomuscular cell
C. Sensory cells
D. Nematoblasts.

Answer

To solve the question regarding the structure "lasso," we will analyze each option provided:

1. **Understanding the term "lasso":**
- The term "lasso" refers to a thread-like structure that is associated with certain cells in the coelenterates (Cnidaria).

2. **Analyzing the options:**
- **(a) Nutritive muscular cell:** These cells are primarily involved in digestion and nutrient absorption. They do not typically have structures like lasso.
- **(b) Epitheliomuscular cell:** These cells are involved in muscle contraction and forming the outer layer of the organism. They do not have lasso structures associated with them.
- **(c) Sensory cells:** These cells are responsible for detecting stimuli in the environment. They do not contain lasso structures.
- **(d) Nematoblasts:** These are specialized cells that contain nematocysts (stinging cells). The lasso is a structure that is attached to the base of the nematocyst and helps prevent it from bulging out until it is stimulated.

3. **Conclusion:**
- Based on the analysis, the lasso is specifically associated with nematoblasts, making option **(d) Nematoblasts** the correct answer.

### Final Answer:
**(d) Nematoblasts**