All the following are growth hormones, except

Explanation

All plant hormones are collectively known as growth hormones. They include growth promoters, e.g., auxins, cytokinins, gibberellins, etc. as well as growth inhibitors such as abscisic acid, etc. All of the options except option 'A' are growth hormones; thus, option 'A' is the correct answer. This division is further explained by the following diagram: