In the context of an adjective used to describe pain, we can look at the answer choices:
Silent pain seems like an odd choice for someone to notify a doctor about, so that is probably not the answer.
Thoughtful does not describe pain.
Responsive does not describe pain.
Severe pain would be a reason for someone to notify a doctor, so this is likely the correct answer choice.
Answer: False
Explanation:
They introduce Adjective clauses.
However adverb conjunctions introduce adverb clauses.
C) is doing
The present participle is most commonly known as the participle that uses the -ing form of the verb.