The correct answer is b) Wayanad.
Ginger is an important spice crop that is mainly grown in the Wayanad district of Kerala. It is a tropical plant that grows best in warm, humid climates. The ginger plant has a thick, fleshy rhizome that is used as a spice. Ginger is used in a variety of dishes, including curries, soups, and desserts. It is also used to make ginger ale and ginger beer.
The Wayanad district is located in the northern part of Kerala. It is a mountainous district with a tropical climate. The district is known for its natural beauty, including its forests, waterfalls, and wildlife. Wayanad is also a major producer of ginger.
The other options are incorrect because they are not districts in Kerala where ginger is mainly grown. Kottayam is a district in the central part of Kerala. Thrissur is a district in the southern part of Kerala. Kozhikode is a district in the northern part of Kerala.