Hunan folk song "Spicy girl is not afraid of spicy when she is young, but when she grows up, she is afraid of spicy when she marries, hanging a string of peppers and touching her mouth" reflects the appearance of local people.

Hunan residents love to eat Chili mainly because of the local climate. China is called salty in the north, sweet in the southeast and spicy in the west. Dry food is salty, hot and humid food is sweet, and hot and humid food is spicy. It is particularly cold when it rains, and the air humidity is high. People living in the local area always feel that it is cold from the inside of the body. Eating peppers is to drive away the cold and get rid of moisture. This is because pepper contains a substance called capsaicin. Eating Chili peppers can make people's heart beat faster, their pores widen, their skin capillaries dilate and thicken, their blood speeds up, their sweat glands open, and they sweat all over, so that the cold and moisture on their bodies are driven out of the body and they will feel warm all over.

So choose: a.