system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following causes decrease in BP
assistant
The correct answer is  NOSubstances which cause vasodilatation can cause fall in BP.Substances which cause vasoconstriction can cause a rise in BP.Among the given options only NO (nitric acid) is vasodilator (causes fall in BP). Other three options cause vasoconstriction (cause rise in BP).