Utilize the input text as a context reference, choose the right relationship between cocoa and chocolate from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Further the report states that the increase in the price of cocoa and sugar has made it difficult for vendors to sell chocolate at a constant price.

Answer: product_or_material_produced