In which one of the following sets of three items each belong to the category mentioned against them ?

Options

A. Lysine , glycine, thiamine - Amino acids
B. Myosin , oxytocin and gastric - Hormones
C. Rennin , helicase and hyaluronidase - Enzymes
D. Optic nerve , oculomotor , vagus -sensory nerves

Answer

To solve the question, we need to analyze each option and determine if all three items in each set belong to the specified category.

### Step-by-Step Solution:

1. **Option 1: Lysine, Glycine, Thiamine**
- Lysine and Glycine are both amino acids.
- Thiamine is Vitamin B1, which is not an amino acid.
- **Conclusion:** This option is incorrect because not all three belong to the category of amino acids.

2. **Option 2: Myosin, Oxytocin, Gastric**
- Myosin is a contractile protein involved in muscle contraction.
- Oxytocin and Gastric (likely referring to Gastrin) are hormones.
- **Conclusion:** This option is incorrect because not all three belong to the category of hormones.

3. **Option 3: Ranine, Helicase, Hyaluronidase**
- Ranine (Chymosine) is an enzyme that helps in milk clotting.
- Helicase is an enzyme that unwinds DNA during replication.
- Hyaluronidase is an enzyme that breaks down hyaluronic acid in the extracellular matrix.
- **Conclusion:** This option is correct because all three items are enzymes.

4. **Option 4: Optic Nerve, Oculomotor, Vagus**
- The Optic nerve is a sensory nerve.
- The Oculomotor nerve is primarily a motor nerve.
- The Vagus nerve is a mixed nerve (both sensory and motor).
- **Conclusion:** This option is incorrect because not all three belong to the category of sensory nerves.

### Final Answer:
The correct option is **Option 3: Ranine, Helicase, Hyaluronidase** as all three are enzymes.