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: Based on the user's historical purchases, rank the items in options and predict the next product of the user's interest from the provided options.

Input:
Purchase History:
1st: Opteka BG-E14 Replacement Vertical Shutter Release Battery Pack Grip for Canon EOS 70D Digital SLR Camera. Electronics. Camera & Photo. Opteka.
2nd: Ultimate Ears Super.fi 5 Pro Earphones (White) (Discontinued by Manufacturer). Electronics. Headphones. Ultimate Ears.
3rd: Sigma APO Teleconverter 2x EX DG for Canon Mount Lenses. Electronics. Camera & Photo. Sigma.
4th: Sigma 28mm f/1.8 EX DG Aspherical Macro Large Aperture Wide Angle Lens for Canon SLR Cameras. Electronics. Camera & Photo. Sigma.
5th: Ultimate Ears TripleFi 10 Noise Isolating Earphones (Discontinued by Manufacturer). Electronics. Headphones. Ultimate Ears.
6th: Sony SEL16F28 16mm f/2.8 Wide-Angle Lens for NEX Series Cameras. Electronics. Camera & Photo. Sony.

Options:
A: Razor Kobra Boy's Bicycle, 18-Inch. Sports & Outdoors. Outdoor Recreation. Razor.
B: BATTOP Bluetooth Keyboard with Leather Case Stand Cover for iPad 4 iPad 3 iPad 2 - Pink NOT FOR IPAD MINI/IPAD MINI2/IPAD MINI3. Electronics. Computers...
C: Juiced Systems 5 Pin to 11 Pin Micro USB Adapter - Hdtv MHL Adapter for Samsung Galaxy Note 2 & Galaxy S3. Electronics. Computers &...
D: Wham-O 81553 Original Striped Hula Hoop . Sports & Outdoors. Sports & Fitness. Wham-O.
E: Chickadee Dishwasher Magnet Cover. Home & Kitchen. Kitchen & Dining. Collections Etc.
F: TBK Industries KoolerGel The Ice Extender LLC. Sports & Outdoors. Outdoor Recreation. TBK Industries.
G: Ultra Clarity FLAT HDMI Cable ( 6 FT ) High Speed HDMI Cable (1.8m) Flat Wire - CL3 Rated, Supports 4K, 3D, 2160p, 1080p, Ethernet...
H: MTECH USA Mt-665Bk Neck Knife 7.5-Inch Overall. Sports & Outdoors. Sports & Fitness. MTECH USA.
I: Audiotek - ATW440P - Car Vehicle 500 Watts 1.75" Titanium Super TweeterPAIR. Electronics. Car & Vehicle Electronics. Audiotek.
J: Nikon Coolpix S640 12.2MP Digital Camera with 5x Wide Angle Optical Vibration Reduction (VR) Zoom and 2.7-inch LCD (Calm Black) . Electronics. Camera & Photo...
K: Canon EF 70-200mm f/2.8L IS II USM Telephoto Zoom Lens for Canon SLR Cameras. Electronics. Camera & Photo. Canon.
L: Owl Wonderful Kitchen Terry Towel (1) Cotton Hostess Gift Kay Dee Designs. Home & Kitchen. Kitchen & Dining. OWL.
M: Pre-Lit LED Lighted Lily Wreath with Burlap Bow, White. Home & Kitchen. Home Dcor. Accents Depot.
N: Williams Firesight Dovetail Set Marlin 925/925M/60 Blue/915Y Blue/983T/98. Sports & Outdoors. Sports & Fitness. Williams.
O: Bakery Crafts - Curious George Cupcake Rings, Food Safe, Approx (1.5 Inches), (24 Count). Home & Kitchen. Kitchen & Dining. Bakery Crafts Supplies.
P: TCL 65US5800 65-Inch 4K Ultra HD Roku Smart LED TV (2016 Model). Electronics. Television & Video. TCL.
Q: Best Price Mattress 2.5" Ventilated Memory Foam Mattress Topper, King. Home & Kitchen. Bedding. Best Price Mattress.
R: Qunqi L293D Motor Drive Shield for Arduino Duemilanove Mega UNO R3 AVR ATMEL. Electronics. Computers & Accessories. Qunqi.
S: Iomega ScreenPlay USB 2.0/AV 500 GB HD Multimedia Drive 34200. Electronics. Television & Video. Iomega.
T: MLB New York Yankees  Garden Flag. Sports & Outdoors. Fan Shop. WinCraft.


assistant
Answer: K