Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: should i use 200 or 400 speed for rainy days
Document: I use a film camera and Fuji is very good. Though these days I worry about not having color film on the market. 200 ASA Fuji film in the four pack is priced reasonably. Since I shoot pictures every day, it is a most necessary item to have in stock. I have used both Kodak and Fuji film equally over the past 40 years. It's all good.
Came as advertised, seems to fill the bill nicely, I have an old Algfa 35 mm and finding film for a camera with a top speed is not easy, Having a source for the product for use in a GREAT camera was a God SendThanks
I dislike penalizing a product because of a vendor, so I am reviewing only the film. I like the high range of the tones in Superia fim, and I love the perfect adaptability of this 200 speed film.
The film is excellent becuase it is Fuji Film,however, the company is promoting the film as Super HQ Speed and it is not. It is regular 200 speed film when it arrives. I was given a full refund and was told to keep the product.
I have always been pleased with Fuji film, because of its emphasis on the blues, greens, and darker hues I find more pleasing that Kodak's. With my Canon T2, I get the best results from FujiFilm, and I can't wait to try the 200 and 800 speed!I am very pleased with my purchase, the speed of the shipment, and the price!
The HQ 200 film is perfect for my use with my Cannon Rebel. The price was great and it arrived quickly. The film had a good process date of  April 2015.
The F6 was just sold. Anyway I used to use Kodak all the time and then near the end of my career FujiFilm started making this incredible fine grain, brilliant color, color film. Now Fujifilm has taken over the market in color film and the ASA or (ISO) if you will 200 is what I shoot the most because of fast good Nikon glass or (lenses).
I love Fujifilm 200 for colpr prints, and it blows up very well also as big as 11" x 16" with just the right amount of grain to make it interesting.As far as I'm concerned, I hope more and more people pick up a good old film camera and learn how to shoot good and well planned out photograph's  because it will make you a better digital photographer when there is no more film or film processing chemicals and all we have is digital to use.
Who uses film these days, right? Fugi film is clearly the best. Everyone knows that! Love the product, takes photos like a dream.
Items arrived four days before expected time; that's excellent. The films are all in good shape and the expiration date is printed on the box. Easy buy.
Answer: It is recommended to use 400 because it is more sensitive to light. You could use 200 but with larger apertures or slower times, which is generally more inconvenient.