Which of the following statements is not correct?

pharmacy

Which of the following statements is not correct?

a) There are at least three subtypes of alfa1 receptors, designated alfa1a, alfa1b and alfa1d

b) ALFA1a subtype mediates prostate smooth muscle contraction

c) ALFA1b subtype mediates vascular smooth muscle contraction

d) ALFA1a subtype mediates both vascular and prostate smooth muscle contraction