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: Rank items in listed options based on the user's purchase history to determine the item that the user is most likely to purchase next. Output the item with the highest likelihood of being the next purchase.

Input:
Purchase History:
1st: Polar RCX5 Heart Rate Monitor. Sports & Outdoors. Sports & Fitness. Polar.
2nd: Pearl Izumi - Ride Elite Thermal Wool Socks. Sports & Outdoors. Outdoor Recreation. Pearl Izumi - Ride.
3rd: SHIMANO 6800 Ultegra 11-Speed Crankset. Sports & Outdoors. Outdoor Recreation. SHIMANO.
4th: Balega Hidden Comfort Athletic No Show Running Socks for Men and Women with Seamless Toe, (X-Large) - Zest Lemon. Sports & Outdoors. Sports & Fitness...

Options:
A: Department 56 Building and Accessory Lighting System. Home & Kitchen. Home Dcor. Department 56.
B: BXQINLENX SC600 DC 12V PC Cpu Water Cooling System Tool Water Pump 132.09 GPH 10W Brushless Drive Water pump for Destop Computer Laptop computer. Electronics...
C: YI Mirror Dash Cam, Dual Dashboard Camera Recorder with Touch Screen, Mobile APP, Front Rear View HD Camera, G Sensor, Reverse Monitor, Loop Recording. Electronics...
D: Platypus Duthie A.M. 10.0 Hydration Pack. Sports & Outdoors. Outdoor Recreation. Platypus.
E: Andaz Press Chocolate Drop Labels Trio, Fits Hershey's Kisses, Wedding Just Married, Aqua, 216-Pack. Home & Kitchen. Event & Party Supplies. Andaz Press.
F: Deluxe 57-inch Professional Camera Tripod and 72 Inch Monopod for Canon Digital EOS Rebel SL1, T1i, T2i, T3, T3i, T4i, T5, T5i, T6i, T6s, EOS...
G: Mini-Din 6 Pin Male Male Black Cable 6 feet. Electronics. Accessories & Supplies. Kray Cables.
H: Heddon Bayou Boogie Lure's. Sports & Outdoors. Sports & Fitness. Heddon Lures.
I: Safavieh Mercer Collection Georgia Vanity Stool, Black. Home & Kitchen. Furniture. Safavieh.
J: Evplkigir 11OZ Coffee Mug - Good Teacher, School Willcallyou. Home & Kitchen. Kitchen & Dining. Evplkigir.
K: Toshiba W512 Hi-Fi VCR. Electronics. Television & Video. Toshiba.
L: Elsse For Kindle 6" Glare Free - Folio Case Cover for Kindle (7th Generation), Dark Blue - will not fit previous generation Kindle devices. Electronics...
M: Qcute Tactical Bag, Single Shoulder Messenger Bag, Chest Bag, Casual Office Tactical Satchel, Small Tool Backpak, Bag Which is Suitable Carrying ipad, Smart Phone, Wallet...
N: Yubi Power Compact Power Strip Surge Protector with 4 USB Ports (Total of 4.8A) and Dual 100-240V Outlets / 3 Feet Long Cord. Electronics. Accessories...
O: Jolly Gear Lacrosse Massage Balls for Self Myofascial Release and Deep Tissue Trigger Point Therapy. Sports & Outdoors. Sports & Fitness. Jolly Gear.
P: Dock Edge Open Base Dock Cleat. Sports & Outdoors. Sports & Fitness. Dock Edge.
Q: Steve Silver Avenue Glass Lazy Susan. Home & Kitchen. Kitchen & Dining. Steve Silver.
R: Domke 700-80B F-8 Small Shoulder Bag - Black. Electronics. Camera & Photo. Domke.
S: Adonit Replacement Discs - Jot Pro (dampening), Jot Flip (dampening), Jot Mini, Jot Touch (2 Pack). Electronics. Computers & Accessories. Adonit.
T: NCAA Ohio State Buckeyes 2014 2015 College Football Playoff National Champions Sublimated Mug, 15-Ounce. Sports & Outdoors. Fan Shop. Boelter Brands.


assistant
Answer: O