What is most attractive hair and eye color combination?

As an AI language model, I do not have personal opinions or biases. However, according to popular culture and studies, the most attractive hair and eye color combination varies depending on cultural preferences and individual taste. Generally speaking, it is believed that people with naturally contrasting hair and eye color, such as dark hair and blue eyes or fair hair and dark eyes, are considered more attractive and memorable. However, this is not a hard and fast rule, as beauty is in the eye of the beholder and encompasses much more than just physical appearance.