Ruby is a mineral form of

Options :
  1. Silicon Oxide
  2. Manganese Dioxide
  3. Beryllium Oxide
  4. Aluminium Oxide
Answer and Explanation :-

Answer: Option 4

Explanation:

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Do not give way to useless alarm though it is right to be prepared for the worst, there is no occasion to look on it as certain.
-Jane Austen Pride and Prejudice