Which ritual involves boys in Thailand and their transition into monkhood?

The correct answer, which pertains to the ritual involving boys in Thailand and their transition into monkhood, is Poy Tang Lon. This ritual is an important aspect of Thai culture and involves a ceremony where boys are ordained as monks, marking their entry into the monastic life.

During Poy Tang Lon, families often celebrate with various traditional practices, and the event signifies not just the boys' commitment to Buddhism but also their coming of age. The ritual reflects the teachings of the Buddha and the significance of monastic life in Thai society. The timing of this event often corresponds with the Buddhist calendar, adding to its cultural and spiritual importance.

In contrast, Genpuku is a Japanese coming-of-age ceremony for boys, while the Quinceanera is a celebration of a girl's 15th birthday in Latin American culture. Dokimasi does not relate to a specific cultural rite of passage in this context. Therefore, Poy Tang Lon stands out as the specific ritual that encapsulates the transition into monkhood for boys in Thailand.