The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following is main cause of pain during pulpal injury progression?   (A) Increased vascular permeability   (B) Decreased threshold of nerve fibres to pain   (C) Arteriolar dilatation   (D) Decrease pressure
['(A) Increased vascular permeability <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Increased vascular permeability \n (B) Decreased threshold of nerve fibres to pain \n (C) Arteriolar dilatation \n (D) Decrease pressure <> possible answers', '  Which of the following is main cause of pain during pulpal injury progression? <> context@']