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: Lens Cap Bundle - 4 Snap-on Lens Covers for DSLR Cameras including Nikon, Canon, Sony - Lens Cap Keepers included (58mm). Electronics. Camera & Photo...
2nd: Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) for Canon Digital SLR Cameras (Model A09E). Electronics. Camera & Photo. Tamron.
3rd: Sigma 18-35mm F1.8 Art DC HSM Lens for Canon. Electronics. Camera & Photo. Sigma.
4th: Lexar Professional 633x 64GB SDXC UHS-I/U3 Card (Up to 95MB/s Read) w/Image Rescue 5 Software - LSD64GCBNL633. Electronics. Computers & Accessories. Lexar.
5th: Sony a7R Full-Frame Mirrorless Digital Camera - Body Only. Electronics. Camera & Photo. Sony.

Options:
A: 8.25" Advent Votive Holder W/Glass Chimneys Without Batteries Candles by Roman. Home & Kitchen. Home Dcor. Church Supply Warehouse.
B: Ovente 2250W 2-Slice Toaster, White. Home & Kitchen. Kitchen & Dining. Ovente.
C: Round Magnetic Bottle Cap Catcher by Starr. Home & Kitchen. Kitchen & Dining. STARR.
D: Fovitec - 2x 7'6" Photography & Video Light Stand Kit - [For Lights, Reflectors, & Modifiers][Collapsible][Spring Cushioned][Carrying Bag Included]. Electronics. Camera & Photo. Fovitec.
E: Airlink101 AWLL5088V2 Wireless N 150 Ultra Mini USB Adapter. Electronics. Computers & Accessories. AirLink.
F: ZHPUAT Smart Light Alarm Clock, Snooze, Nature Sound & Recording Ringing, Date, Temperature (C& F), Timer, Progressively Alarm, Both DC & Batteries Operated (Green). Home...
G: 5.8Ghz STB Wireless Sharing Device AV Transmitter / Sender & IR Remote Extender With 200M Transmitting Distance. Electronics. Television & Video. DBPOWER.
H: Mini DP to HDMI VGA Adapter,CableDeconn Multi-Function Mini DisplayPort (Compatible Thunderbolt) to HDMI VGA Converter Adapter Cable Apple MacBook Suface Pro Air PC. Electronics. Computers...
I: TaylorMade Men's Tour Crown High Visor. Sports & Outdoors. Sports & Fitness. TaylorMade.
J: FOCO NFL Unisex Team Gift Sticker Sheet. Sports & Outdoors. Fan Shop. FOCO.
K: 50th Anniversary Guest Registry Book. Home & Kitchen. Event & Party Supplies. Darice.
L: 720P HD MOTION DETECT CAR VIDEO CAMERA RECORDER DVR 2.5" TFT LCD Screen 1/4 color CMOS HD Sensor. Electronics. Car & Vehicle Electronics. sunvalleytek.
M: Monoprice 100667 6-Inch 3.5mm Stereo Plug/Two 3.5mm Stereo Jack Cable. Electronics. Accessories & Supplies. Monoprice.
N: SJCAM Original SJ4000 WiFi Action Camera 12MP 1080P H.264 1.5 Inch 170° Wide Angle Lens Waterproof Diving HD Camcorder Car DVR with Free Makibes Cleaning...
O: Mealcon BenT-20P Plastic Meal prep containers 3 Compartment, 20 pk, Black. Home & Kitchen. Kitchen & Dining. Mealcon.
P: Mares Instinct Pro Polytec Spearfishing Fins. Sports & Outdoors. Outdoor Recreation. Mares.
Q: Two Halcyon 1500 mAH Lithium Ion Replacement Battery and Charger For Olympus LI-50B. Electronics. Camera & Photo. Halcyon.
R: Canon EF 70-200mm f/4L USM Telephoto Zoom Lens for Canon SLR Cameras. Electronics. Camera & Photo. Canon.
S: Leader Accessories Coffee Dog Couch Protector Sofa Furniture Protector Slipcover Sofa Cover. Home & Kitchen. Home Dcor. Leader Accessories.
T: Midland Radio 75-822 Portable Mobile CB Radio, Large LCD Display, Keypad Lock, Plug and Play, Rugged Construction, Up To 40 Channels. Electronics. Portable Audio &...


assistant
Answer: R