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:
            e ridge. 
Mesial marginal ridge (MMR) and distal marginal ridge (DMR). 
Depressions: 
2 major fossae (central rounded or triangular & distal elongated) 
The central fossa is present mesial to the oblique ridge and it contains in its 
depth a central developmental pit. 
- The distal fossa is found distal to the oblique ridge. 
2 Minor fossae (mesial and distal triangular fossae). 
Developmental grooves are (buccal groove, central groove, transverse groove 
of oblique ridge, distal oblique groove and lingual groove). 
The buccal groove extends from the central pit till between the two buccal 
cusps on the buccal surface. 
The central groove extends from the central pit till the apex of the Mesial 
triangular fossa. 
D 
 
8 
 
The transverse groove of oblique ridge radiates from the central pit and runs 
transversely and distally across the oblique ridge till the distal fossa to join the 
central and distal fossae. 
The distal groove traverses the distal fossa lingually between the lingual 
cusps and continues on the lingual surface as the lingual groove. 
Pulp cavity 
Pulp Chamber: 
- -The pulp chamber is broader bucco-lingually than mesio-distally 
- -There is pulp horn beneath each cusp 
- hefloor is apical to the cervical line  
 
buccal 
mesial 
9 
 
Root Canals: 
- Three main root canals: mesiobuccal (MB), distobuccal (DB) & Palatal. 
- Mesiobuccal (MB) root may have 2 root canals. 
- The palatal root canal is relatively large and easily accessible during 
endodontic treatment. 
Note: 
- Cervical cross section: Rhomboidal. 
- Mid root section: Mesiobuccal (MB) root canal (Oval- Kidney). 
- Distobuccal (DB) root canal (Round-Oval). Palatal root canal (Round- 
Oval). 
Maxillary Permanent Second Molar 
- It performs the same function as the first molar, thus it has the same outline, 
but there is no cusp of Carabelli. 
- The rhomboidal outline is more accentuated. 
- The roots are less divergent than those of upper first molar, parallel and 
slightly longer in proportion to the crown. 
- Occlusaly: two types of maxillary second molar are present: 
1- Occlusal surface is similar to that of the first maxillary molar (most 
common form) 
2- Occlusal surface with   no distolingual cusp giving 
the occlusal aspect a 
heart shape appearance which typically resembles the maxillary third 
molar 
 
BUCCAL 
PALATAL 
MESIAL 
DISTAL 
 
 
OCCLUSAL
 
10 
 
BUCCAL ASPECT 
1. The Crown 
 The geometric outline: Trapezoidal with smallest 
uneven side present cervically. 
 Mesial outline: Nearly straight till the contact area at 
the junction of occlusal and middle third.  
 Distal outline: Convex till the contact area at the 
middle third.  
 Cervical outline: Irregular and slightly convex 
towards 
the root. 
- - Crown of upper second molar is shorter & narrower mesiodistally ( M-D) 
than 
the upper first molar. 
- In upper second molar, the mesio-buccal (MB) cusp is broader and longer 
than the disto-buccal (DB) cusp which is less developed than that in uppe

            Quiz: