system: You are an expert security code reviewer. You will be shown a source code file along with a multiple-choice question listing several function or class names from that file. Your task is to identify which one contains the specified CWE vulnerability.

OUTPUT FORMAT: Respond with the single letter of the correct option, wrapped in \boxed{...}. Example: `\boxed{B}`. Output the boxed letter ONLY -- no explanation, no other text.

user: ```python
import os
import uuid
import json
from glob import glob
import numpy as np
import requests
import pandas as pd

import tornado.web
from tornado import concurrent
from tornado import gen
from concurrent.futures import ThreadPoolExecutor

from app.base_handler import BaseApiHandler
from app.settings import MAX_MODEL_THREAD_POOL

from scipy.misc import imread
from sigver.sigver_api import train, get_feature

#Train the user-dependent model using pictures in 'trainsig' folder
svm_model = train('sigver/trainsig/')

class IndexHandler(tornado.web.RequestHandler):
    """APP is live"""

    def get(self):
        """Return Index Page"""
        self.render("templates/index.html", image=None, image_url=None, predictions_df=None)

    def head(self):
        """Verify that App is live"""
        self.finish()

    def post(self):
        image_url = self.get_argument("image-url")
        image_files = self.request.files.get("image-file")
        print(image_url)
        image_location = "temp-img"
        image_filename = None
        if image_files:
            image_file = image_files[0]
            fname = image_file["filename"]
            extn = os.path.splitext(fname)[1]
            image_filename = str(uuid.uuid4()) + extn
            image = "app/static/temp-img/" + image_filename
            with open(image, "wb") as fh:
                fh.write(image_file["body"])

        # upload_recs = recommend_pets(cname)
        # print(upload_recs)
        # return self.render("templates/recommended-pets.html", images=[upload_recs])
        elif image_url:
            image_filename = str(uuid.uuid4()) + ".jpg"
            image = "app/static/temp-img/" + image_filename
            with open(image, "wb") as fh:
                fh.write(requests.get(image_url).content)
        else:
            return self.redirect("/")
        print(image)

        #Load image
        original = imread(image, flatten = 1)
        results = svm_model.predict([get_feature(original)])
        df = pd.DataFrame(results).T
        df.columns = ["Prediction"]
        print(results)
        return self.render("templates/index.html",
            image=image_filename,
            image_location=image_location,
            image_url=image_url,
            predictions_df=df[["Prediction"]].to_html(classes="table table-striped"))


class PredictionHandler(BaseApiHandler):
    """Main Prediction Handler"""

    _thread_pool = ThreadPoolExecutor(max_workers=MAX_MODEL_THREAD_POOL)

    def initialize(self, model, *args, **kwargs):
        """Initiailze the models"""
        self.model = model
        super().initialize(*args, **kwargs)

    @concurrent.run_on_executor(executor='_thread_pool')
    def _blocking_predict(self, x):
        """Blocking Call to call Predict Function"""
        # target_values = self.model.predict(X)
        # target_names = ['setosa', 'versicolor', 'virginica']
        # results = [target_names[pred] for pred in target_values]
        # return results
        return {
            "sleeve_length": {
                "prediction": "Full Sleve",
                "confidence": 0.58
            }
        }

    @gen.coroutine
    def predict(self, data):
        """Return prediction result"""
        print(data)
        results = yield self._blocking_predict(data)
        self.respond(results)

```

Which of the following functions or classes contains a `CWE-918: Server-Side Request Forgery (SSRF)` vulnerability?

  A) post
  B) PredictionHandler
  C) IndexHandler
  D) initialize
Answer: A