Show and hide three text fields based on drop down

I have a "Dropdown2" with different product names and I have added prices in their export values. Some export values have same prices. I need to show and hide three text fields based on dropdown names and their export values. Three text fields are named as Huawei, Fenecon and BYD HVS. Here are few options 

Huawei 5,0 - 5400
Huawei 15,0 - 9900

Fenecon S8,8 - 8900
Fenecon S15,4 - 11800
Fenecon S17,6 - 12700
BYD HVS 5,1 - 8900
BYD HVS 7,7 - 9900

5400 9900 ... these are export values. So when I select any option from Huawei then only huawei field should be visible and other two hidden. So same like for Fenecon and BYD HVS.