The given answer is "Real Smile" because a real smile, also known as a Duchenne smile, involves the contraction of both the zygomatic major muscle (which raises the corners of the mouth) and the orbicularis oculi muscle (which raises the cheeks and creates crow's feet around the eyes). This creates a genuine, sincere expression of happiness or joy. In contrast, a fake smile typically only involves the movement of the mouth, without engaging the muscles around the eyes.