The colour vision is governed by all of the following colour sensitive pigments EXCEPT:-: (A) Porphyropsin, (B) Transducin, (C) Iodopsin, (D) Cyanopsin
Answer is B. The colour vision is governed by colour sensitive pigments-porphyropsin (red), iodopsin (green) and  cyanopsin (blue).
Reference: Satyanarayana- Biochemistry, 3rd edition, pg-122