 
 <translate> The relevant sentence in the passage is: The Hong Kong dollar (Chinese: 港幣; Cantonese Yale: Góng bàih; sign: HK $; code: HKD) is the official currency of Hong Kong.
So, the final answer is The Hong Kong dollar. <ibo> Ahịrịokwu dị mkpa na amaokwu ahụ bụ: The Hong Kong dollar (Chinese; Cantonese Yale; akara: HK $; koodu: HKD) bụ ego gọọmentị nke Hong Kong. Ya mere, azịza ikpeazụ bụ dollar Hong Kong. 