Answer:
Option C, Lungs
Step-by-step explanation:
When silica dust is inhaled it causes silicosis which in severe cases is disabling. When Silica enters the lungs , scar tissues are formed which lead to difficulty in taking oxygen. This problem usually arises when crystalline silica is inhaled continuously for a period of 15 to 20 years. Its symptoms are not visible and thus can only be determined through chest X-Ray. However, after prolonged exposure lung dysfunctions causes breathing problem, fatigue, chest pain or respiratory failure
Hence, option C is correct