Task: Sequential_Recommendation

system
You are a helpful assistant. The assistant first thinks about the reasoning process in the mind by using Belief-Desire-Intention (BDI) framework and then provides the user with the answer. The reasoning process and answer are enclosed within <think> </think> and <answer> </answer> tags, respectively. 
Below is an instruction that describes a task. After thinking, when you finally reach a conclusion based on the customer's intention, desire and belief, clearly state the BDI thinking process within <think> </think> and then the answer within <answer> </answer> tags.


user 
Instruction: Given the products the user has purchased in history, rank the items in the listed options and output the item that the user is most likely to purchase next. Answer from one of the options.

Input:
Purchase History:
1st: Camera Case for Fujifilm FinePix A100, A150, A170, F20, F30, F31FD, F50FD, F60FD, J20, J29, J50, J100, J110W, J120, J150W, J250, Z1, Z3, Z5FD, Z10FD,...
2nd: BlackBerry PRD-38548-003 Playbook 7" Tablet, 64GB. Electronics. Computers & Accessories. BlackBerry.

Options:
A: TriSquare eXRS TSX300-2VP 900MHz FHSS Digital Two-Way Radio (Charcoal Metallic/Black) (Pair) (Discontinued by Manufacturer). Electronics. Portable Audio & Video. TriSquare.
B: Beelink R89 Android 4.4 Smart TV Box Stream Media Player, Quad Core RK3288 1.8GHz CPU, Quad Core Mali-T764 GPU, 4K*2K H.265 hardware decoding 3D Blu-Ray...
C: Whitmor  Supreme Small 3-Tier Shelving , White. Home & Kitchen. Storage & Organization. Whitmor.
D: Vinyl Pillow Protector with Zipper (6 Gauge), King. Home & Kitchen. Bedding.
E: Lowepro Slingshot 302 DSLR Sling Camera Bag. Electronics. Camera & Photo. Lowepro.
F: No Soliciting Sign for Indoor or Outdoor use by MySigncraft. Home & Kitchen. Home Dcor. MySigncraft.
G: AGPtekÂ AC Power Home Wall Charger Adapter For Microsoft Surface Windows RT Surface 2 Tablet. Electronics. Computers & Accessories. AGPTEK.
H: Andoer Professional DSLR Camera Tool set 3 Tips10-100mm 1 * Lens Repair Set+4 * Srecws+2 * Hexagon Wrench for Canon Nikon Sony Olympus Camera. Electronics...
I: RSVP Flexible Nylon Spatulas - Set of 3: Blue. Home & Kitchen. Kitchen & Dining. RSVP.
J: Belkin Essential 034 Case for Apple iPod Touch 4th Generation (Fountain Blue). Electronics. Portable Audio & Video. Belkin.
K: Salomon Soft Flask. Sports & Outdoors. Sports & Fitness. Salomon.
L: Creative Converting 101152 Picks Candle, 3", Multicolored. Home & Kitchen. Home Dcor. Creative Converting.
M: Your Cable Store 6 Foot 1/4" (6.3mm) Stereo Headphone Cable. Electronics. Accessories & Supplies. Your Cable Store.
N: IOGEAR Multi-Link Bluetooth Keyboard with Touchpad GKM611B (Black/Grey). Electronics. Computers & Accessories. IOGEAR.
O: LimoStudio Set of 5 Photo Studio Universal Pro Muslin/Paper Clamps, AGG900. Electronics. Camera & Photo. LimoStudio.
P: HLC.ME Matte Sheer Window Treatment Curtain Panels - Pair - 84" inch Long (Burgundy). Home & Kitchen. Home Dcor.
Q: Cuppa Second Amendment Rights 15-Ounce Coffee Mug with Assault Rifles. Home & Kitchen. Kitchen & Dining. CUPPA.
R: SANOXY® New Purple 360 Degrees Rotating Leather Case Smart Cover with Stand and Sleep/Wake Function for Apple iPad 2/3/3 Built-in Magnet-Purple. Electronics. Computers & Accessories...
S: Mtech Assisted Opening Rescue Tactical Pocket Folding Collection Knife Outdoor Survival Camping Hunting - Blue. Sports & Outdoors. Sports & Fitness. M-Tech USA.
T: Lajolla® 15" x 15" Cargo Flexible Net for Motorcycles, Car, Atvs etc (Black).


assistant
Answer: R