Which liqueur is known for its use of herbs and spices, often described as having a complex flavor?

Benedictine is the liqueur known for its intricate blend of herbs and spices, which contributes to its unique and complex flavor profile. This herbal liqueur is made from a secret recipe that purportedly includes 27 different herbs and spices, combined with brandy. The combination of these ingredients results in a multi-layered taste that can include hints of honey, chamomile, and various botanicals.

The other options have distinct characteristics that set them apart. Amaretto is primarily almond-flavored, lending a sweet and nutty taste without the intricate herbal complexity that Benedictine offers. Baileys Irish Cream is rich and creamy, combining Irish whiskey with cream and sugar, which focuses more on sweetness than herbal notes. Anisette has a strong anise flavor, which is more singular and less complex compared to the various herb-infused layers found in Benedictine. Therefore, when considering liqueurs known for their complexity derived from a diverse array of herbs and spices, Benedictine stands out as the correct answer.