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 urllib.request, urllib.parse, urllib.error
#import json
from bs4 import BeautifulSoup
import os

from flask import Flask
from flask import request
from flask import make_response

# Flask app should start in global layout
app = Flask(__name__)

@app.route('/webhook', methods=['POST'])
def webhook():
    req = request.get_json(silent = True , force = True)

    res = ProcessJson(req)
    r = make_response(res)
    r.headers['Content-Type'] = 'application/json'
    return r

def ProcessJson(req):

    temp = req['queryResult']['parameters']['Get-Date']
    temp = temp.split('T')
    date = temp[0]
    train_number = req['queryResult']['parameters']['TrainNumber']
    stn_name = req['queryResult']['parameters']['Get-Station']

    baseLink = 'https://erail.in/train-running-status/' + train_number

    html = urllib.request.urlopen(baseLink).read()
    soup = BeautifulSoup(html,'html.parser')
    tags= soup('a')
    for tag in tags :
        if (stn_name in tag.contents[0]):
            tempurl = tag.get('href', None )
    del tags, html, soup

    url = urllib.parse.urljoin(baseLink,tempurl) + '&date=' + date

    html = urllib.request.urlopen(url).read()
    del url
    soup = BeautifulSoup(html,'html.parser')
    del html
    a = soup.find_all('span')
    b = None
    for tag in a:
        if('Train does not run on' in str(tag.contents[0])):
            b=str(tag.contents[0])
    if(b is not None):
        p = {"fulfillmentMessages":[{"simpleResponses":{"textToSpeech":b,"ssml":b,"displayText":b}}]}
        json_response = p
        return json_response
    else:
        info = list()
        arr = list()
        info1 = list()
        tags = soup('tr')
        count = 0
        for tag in tags :
            if(tag.get('class') == ['arr']):
                arr = tag
            if(tag.get('class') == ['info']):
                if(count == 0):
                    info=tag
                    count+=1
                    continue
                if(count != 0):
                    info1=tag
                    break
        del count, tags
        actual_arr = None
        delayed_arr = None
        i = None
        j = None
        if(arr != []):
            try:
                a= arr.strings
                next(a)
                actual_arr = next(a).strip(',')
                delayed_arr = next(a).strip(',')
                del a,arr
            except:
                actual_arr = "Details Not Availabe"
                delayed_arr = "Details Not Availabe"
        if(info != []):
            try:
                a = info.strings
                i = str(next(a)) + str(next(a)) + str(next(a))
                print(i)
                del a,info
            except:
                 i = "Details Not Availabe"

        if(info1 != []):
            try:
                a = info1.strings
                j = str(next(a)) + str(next(a))
            except:
                j = "Details not available"
        response = "Actual Arrival : " + str(actual_arr) +"\nDelayed Arrival : " + str(delayed_arr) + "\nTrain Info : " + str(i) + " . " + str(j)
        p = {"fulfillmentMessages":[{"simpleResponses":{"textToSpeech": response,"ssml": response,"displayText": response}}]}
        json_response = p
        return json_response

if __name__ == '__main__':
    port = int(os.getenv('PORT', 5000))

    print("Starting app on port %d" % (port))

    app.run(debug=False, port=port, host='0.0.0.0')

```

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

  A) ProcessJson
  B) webhook
Answer: A