NSMutableArray* answers;

@interface Answer : NSObject {
    //NSString* answerId;
    NSString* answer;
    NSString* questionId;
}

//@property (nonatomic, retain) NSString* answerId;
@property (nonatomic, retain) NSString* answer;
@property (nonatomic, retain) NSString* questionId;

@end

NSMutableArray *jAnswers = [[[NSMutableArray alloc] init] autorelease];
for(Answer *answ in answers)
{
    NSMutableDictionary *jAnswer = [[[NSMutableDictionary alloc] init] autorelease];
    [jAnswer addObject: answ.answer forKey: @"answer"];
    [jAnswer addObject: answ.questionId forKey: @"questionId"];
    [jAnswers addObject: jAnswer];
}

NSString *jAnswersJSONFormat = [jAnswers JSONString];

[{"answer": "1", "questionId": "1"}, {"answer": "5", "questionId": "2"}, ...]

- (NSString *)JSONStringWithOptions:(JKSerializeOptionFlags)serializeOptions serializeUnsupportedClassesUsingDelegate:(id)delegate selector:(SEL)selector error:(NSError **)error;
- (NSString *)JSONStringWithOptions:(JKSerializeOptionFlags)serializeOptions serializeUnsupportedClassesUsingBlock:(id(^)(id object))block error:(NSError **)error;