Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Silicosis ?
    ### Response:
    Silicosis is a respiratory disease caused by breathing in (inhaling) silica dust. There are three types of silicosis: Simple chronic silicosis, the most common type of silicosis, results from long-term exposure (usually more than 20 years) to low amounts of silica dust.
    