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P: a drug was developed
Q: to alleviate chest pains in
R: from a species of holly
S: patients suffering from coronary diseases

  • A.PQRS
  • B.PRQS
  • C.PSRQ
  • D.
    RQSP

Answer: B

Correct answer: PRQS

The sentence reads:

A drug was developed from a species of holly to alleviate chest pains in patients suffering from coronary diseases.

P is the main clause, R gives the source, Q the purpose, and S the patients, which in at the end of Q requires.

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