Correct option is (b) Ca^+2 channel
The explanation: CCH1 gene in yeast codes for a component of a yeast Ca^+2 channel that mediates Ca^+2 uptake in response to mating pheromone, salt stress, and Mn^2+ depletion. The human gene homologous to CCH1 is CACNL-A4 which is responsible for migraine.