In a study where participants rated the pleasantness of T-shirt odors, what gene alleles influenced their odor preference? a. Serotonin transporter b. Phosphatase enzyme c. Blood type d. Major histocompatibility complex

Major histocompatibility complex

Explanation: In a variety of animals, including humans, there is a correlation between odor preference, and genetic similarity at the Major Histocompatibility Complex (MHC).

MHC is a highly polymorphic group of genes that play an important role in the immunological self/non self recognition. Its products have been recognised to take part on the numerous compounds and reactions that build up an individual's body odor.