A person `X` discovered froth flotation method which is a type of process `Y` in metallurgy. Then X and Y are respectively.

Options

A. Fisherman, reduction
B. Washerman, reduction
C. Fisherwoman, concentration
D. Washerwoman, concentration

Answer

To solve the question, we need to identify the person who discovered the froth flotation method and the type of process it represents in metallurgy.

### Step-by-Step Solution:

1. **Identify the Discoverer (X)**:
- The question states that person `X` discovered the froth flotation method.
- From our knowledge, the froth flotation method was discovered by a washerwoman named **M. J. H. (M. J. H. is often referred to as a washerwoman in historical contexts)**.

2. **Identify the Process Type (Y)**:
- The froth flotation method is a technique used in metallurgy.
- Specifically, it is a method for the **concentration of ores**, particularly **sulphide ores**.
- Therefore, the type of process `Y` is **concentration of sulphide ores**.

3. **Final Answer**:
- Thus, person `X` is **M. J. H. (the washerwoman)** and process `Y` is **concentration of sulphide ores**.

### Summary:
- X = M. J. H. (the washerwoman)
- Y = Concentration of sulphide ores