Which one of the is the correct matching of three items and their grouping category ?

Options

A. Actin, myosin, rhodopsin - Muscle
B. Cytosine, uracil, thiamine - Pyrimidines
C. Malleus, incus, cochlea - Ear ossicles
D. Iilium, ischium, pubis - Coxal boneso pelvic girlde

Answer

To determine the correct matching of three items and their grouping categories from the provided options, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Examine Option 1: Actin, Myosin, and Rhodopsin**
- Actin and myosin are known muscle proteins that play a crucial role in muscle contraction.
- Rhodopsin, however, is a light-sensitive pigment found in the retina of the eye, not a muscle protein.
- Therefore, this option incorrectly groups rhodopsin with muscle proteins.
- **Conclusion:** This option is incorrect.

2. **Examine Option 2: Cytosine, Uracil, and Thymine**
- Cytosine and thymine are both pyrimidine bases found in DNA.
- Uracil is a pyrimidine base found in RNA, where it replaces thymine.
- While all three are indeed pyrimidines, the option does not specify whether it refers to DNA or RNA, which creates ambiguity.
- **Conclusion:** This option is also incorrect due to lack of clarity in grouping.

3. **Examine Option 3: Malleus, Incus, and Cochlea**
- Malleus and incus are two of the three auditory ossicles in the middle ear, while the cochlea is a part of the inner ear.
- The correct grouping should include the third ossicle, the stapes, along with malleus and incus, making this grouping incorrect.
- **Conclusion:** This option is incorrect.

4. **Examine Option 4: Ileum, Ischium, and Pubis**
- The ileum is part of the small intestine, while ischium and pubis are parts of the pelvic girdle.
- However, the correct grouping should refer to the three bones that make up the pelvic girdle, which are the ilium, ischium, and pubis.
- Therefore, this option correctly matches the three items with their grouping category.
- **Conclusion:** This option is correct.

### Final Answer:
The correct matching of three items and their grouping category is **Option 4: Ileum, Ischium, and Pubis**.

---