I am hoping that I can select all the stock in the drop down menu, hit the "Search" button and hit "Export to CSV" button. However, I am stuck that I am not able to hit the Search button after choosing the option. Please advise. Thank you

```
   from selenium import webdriver
   from selenium.webdriver.support.ui import Select, WebDriverWait
   from selenium.webdriver.common.by import By
   from selenium.webdriver.support import expected_conditions as EC
   from time import ctime

   browser = webdriver.Chrome()
   browser.get("https://www.hkex.com.hk/eng/sorc/options/statistics_hv_iv.aspx")

   select = Select(WebDriverWait(browser, 10).until(EC.element_to_be_clickable((By.XPATH,        
    "//select[@id='underlying']"))))

   browser.implicitly_wait(10)
   optionsList = []

   #iterate over the options, place attribute value in list
   for option in select.options:
       option.click()
       optionsList.append(option.get_attribute("value"))

       # below code is not able to work properly but this is only what I am hoping to work
       elem = browser.find_element_by_link_text("Search")
       elem.click()
       elem1 = driver.find_element_by_link_text("Export to CSV")
       elem1.click()
       print(elem)

   print(optionsList)
   print(len(optionsList))

   browser.quit

```