Concept:
Flavor in fruits is a complex mixture of volatile compounds such as esters, alcohols, and terpenes.
• Terpenes: Hydrocarbons produced by many plants, often having a strong odor.
• Limonene: A common monoterpene found in fruit peels.
Step 1: Analyzing Citrus flavor.
Citrus fruits like orange and lemon are rich in monoterpenes.
Limonene accounts for nearly 90% of citrus oil.
Step 2: Analyzing Mango flavor.
Mangoes contain a high concentration of hydrocarbons known as terpenes.
Terpinolene and $\alpha$-pinene provide the characteristic resinous aroma to mangoes.
Step 3: Conclusion.
Among the given options, Citrus and Mango are the primary examples of terpene-rich fruits.
Final Answer: (A)