Update README.md

README.md

@@ -46,11 +46,11 @@ The question-answer pairs are in English.
 ## Dataset Structure
 
 ### Data Instances
-Each instance consists of an image-question-answer triplet. The 'image' field is the filename of the referenced image, 
+Each instance consists of an image-question-answer triplet. The `'image'` field is the filename of the referenced image, 
 excluding the file extension, which is `.jpg`. 
 
 Example from training dataset:
-```json
+```python
 {
   'image': 'train_0001',
   'question': 'What is the appearance of the chromatin texture,  with fine and coarse clumps?',
@@ -58,7 +58,7 @@ Example from training dataset:
 }
 ```
 Example from validation dataset:
-```json
+```python
 {
   'image': 'val_0000',
   'question': 'How are the organisms?',
@@ -66,7 +66,7 @@ Example from validation dataset:
 }
 ```
 Example from test dataset:
-```json
+```python
 {
   'image': 'test_0001',
   'question': 'Is squamous cell carcinoma composed of nests of malignant cells that partially recapitulate the stratified organization of squamous epithelium?',