Match the Column - I with Column - II
`{:("Column-I",,"Column-II"),("(a) P-wave",,"(i) Depolarisation of ventricles"),("(b) QRS complex",,"(ii) Repolarisation of ventricles"),("(c) T. Wave",,"(iii) Coronary ischemia"),("(d) Reduction in the size of T-wave",,"(iv) Depolarisation of atria"),(,,"(v) Repolarisation of atria"):}`
Select the correct option:

Options

A. `{:(,(a),(b),(c),(d)),((1),(ii),(iii),(v),"(iv)"):}`
B. `{:(,(a),(b),(c),(d)),((2),(iv),(i),(ii),"(iii)"):}`
C. `{:(,(a),(b),(c),(d)),((3),(iv),(i),(ii),"(v)"):}`
D. `{:(,(a),(b),(c),(d)),((4),(ii),(i),(v),"(iii)"):}`

Answer

To solve the matching question between Column-I and Column-II, we will analyze each item in Column-I and find the corresponding item in Column-II.

### Step-by-Step Solution:

1. **Match (a) P-wave:**
- The P-wave represents the depolarization of the atria. This occurs when the sinoatrial (SA) node sends an electrical impulse that causes the atria to contract.
- **Match:** (a) P-wave → (v) Repolarisation of atria.

2. **Match (b) QRS complex:**
- The QRS complex represents the depolarization of the ventricles. It is characterized by the rapid contraction of the ventricles following the atrial depolarization.
- **Match:** (b) QRS complex → (i) Depolarisation of ventricles.

3. **Match (c) T-wave:**
- The T-wave represents the repolarization of the ventricles. After the ventricles contract, they need to repolarize in preparation for the next heartbeat.
- **Match:** (c) T-wave → (ii) Repolarisation of ventricles.

4. **Match (d) Reduction in the size of T-wave:**
- A reduction in the size of the T-wave can indicate coronary ischemia, which is a condition where there is reduced blood flow to the heart muscle.
- **Match:** (d) Reduction in the size of T-wave → (iii) Coronary ischemia.

### Final Matches:
- (a) P-wave → (v) Repolarisation of atria
- (b) QRS complex → (i) Depolarisation of ventricles
- (c) T-wave → (ii) Repolarisation of ventricles
- (d) Reduction in the size of T-wave → (iii) Coronary ischemia

### Correct Option:
The correct option based on the matches is:
- A → v
- B → i
- C → ii
- D → iii