--------- is used as dry lubricant

Options :
  1. diamond
  2. coke
  3. charcoal
  4. graphite
Answer and Explanation :-

Answer: Option 4

Explanation:

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My dear Watson," said [Sherlock Holmes], "I cannot agree with those who rank modesty among the virtues. To the logician all things should be seen exactly as they are, and to underestimate one's self is as much a departure from truth as to exaggerate one's own powers.
-Arthur Conan Doyle The Adventure of the Greek Interpreter