Teacher:Generate a correct and concise answer for the question based on the words in the context.
Teacher: Now, understand the problem? Solve this instance: Context : PetroChina Company Limited (simplified Chinese: ; traditional Chinese: ; Uyghur: ) is a Chinese oil and gas company and is the listed arm of state-owned China National Petroleum Corporation (CNPC), headquartered in Dongcheng District, Beijing.
Question : Which company is the parent company of PetroChina?
Student:
China National Petroleum Corporation