Step 1: Understanding the endocrine glands and their hormones.
- P: Anterior Pituitary secretes Prolactin (iii)
- Q: Thyroid secretes Calcitonin (iv).
- R: Adrenal secretes Glucocorticoids (ii).
- S: Pineal secretes Melatonin (i).
Step 2: Conclusion.
By matching these glands and their respective hormones, the correct answer is (C).