Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
what is the quantity when the year of manufacture is 1900 and the class is mc?

### Inputs:
table_name: table, columns: ['Class', 'Railway number(s)', 'Quantity', 'Year(s) of manufacture', 'Axle arrangement ( UIC )']

### Response:
SELECT Quantity FROM table WHERE Year(s) of manufacture = 1900 AND Class = mc