Pretend you are a teacher preparing a quiz for the text I will provide. 
            Each quiz question should follow the format below. 
            Ensure that you carefully recheck the questions and answers for accuracy. 
            The output should be a ready-to-use list of dictionaries for the Python eval function:

            [

                    "question": "WRITE THE QUESTION HERE",
                    "options": ["A) OPTION_1", "B) OPTION_2", "C) OPTION_3", "D) OPTION_4"],
                    "answer": INDEX_OF_CORRECT_ANSWER_IN_OPTIONS_LIST,
                    "explanation": "EXPLAIN WHY THE ANSWER IS CORRECT"

            ]

            Text:
            	1. PDL injection, in the absence of infection or severe periodontal involvement.
	 2. Intraseptal injection .	      
	3. Supraperiosteal injection.
	4. Regional nerve block .
1.Technique :
Selection of site for injection :
a. Lateral perforation:
	i. At a point 2 mm apical to the intersection of lines drawn horizontally along the gingival margins of the teeth and a vertical line through the interdental papilla.
	ii. The site should be located distal to the tooth to be treated, if possible, although this technique provides anaesthesia in most cases when anaesthetic is injected anterior to the tooth being treated.
	iii. Avoid injecting anaesthetic in the mental foramen area (increased risk of nerve damage).
b. For edentulous areas:
Perforate at a point on the alveolar crest mesial or distal to the treatment area (also called the crestal anaesthesia technique).
2. Technique:
A . Remove the X-Tip from its sterile vial.
 i. Hold the protective cover as you insert the X-Tip onto the slow-speed handpiece .
B . Prepare soft tissues at the perforation site:
i. Prepare tissue with sterile gauze.
ii. Apply topical anaesthetic
iii. Place the bevel of the needle against gingiva injecting a small volume of local anaesthetic until blanching occurs.
C . Perforation of the cortical plate: 
i. While holding the perforator perpendicular to the cortical plate, gently push the perforator through the attached gingiva until its tip rests against bone .
ii. Activate the handpiece, using a gentle “pecking” motion on the perforator until a sudden loss of resistance is felt. Cortical bone will be perforated within 2 seconds (Fig. 15.13).
iii. Hold the guide sleeve in place as the drill is withdrawn (Fig. 15.14).
D. Injection into cancellous bone:
	i. It is easy to insert the needle into the hole when a short needle is used   (Fig. 15.15).
	ii. Press the tapered needle gently against the guide sleeve to minimize local anaesthetics leakage.
	iii. Slowly and gently inject the local anaesthetics solution
E. The recommended doses for the X-Tip are the same for each local anaesthetic solution as is recommended for other injections.
Signs and Symptoms :
	1. Subjective: ischemia of soft tissues at the injection site .
	2. Objective: use of freezing spray (e.g., Endo-Ice) .
Safety Feature :
The area into which anaesthetic is injected is quite vascular. Slow injection of the recommended volume of solution is important to keeping intraosseous anaesthesia safe.
Precautions :
	1. Do not inject anaesthetic into infected tissue.
	2. Do not inject anaesthetic rapidly.
	3. Do not inject too much solution.
	4. Do not use a vasopressor-containing local anaesthetic unless necessary, and then only 1:200,000 or 1:100,000 concentration. Avoid use of epinephrine 1:50,000.
Failures of Anaesthesia :
	1. Infected or inflamed tissues. Changes in tissue pH minimize the effectiveness of the anaesthetic .
	2. Inability to perforate cortical bone. 


Complications :
	1. Palpitation: This occurs when a v

            Quiz: