See the multi-choice question below:

Sentence 1: The first warning that these drugs could pose health risks came a year ago, when the New England Journal of Medicine published an article by French researchers linking fen-phen to a deadly cardiac disease called primary pulmonary hypertension.

Sentence 2: Primary pulmonary hypertension has been linked to a drug called fen-phen.

If the first sentence is true, then is the second sentence true?
(A). yes. (B). it is not possible to tell. (C). no.
(A).