Brain teasers like this puzzle challenge enhance critical thinking and brain function. The task is to determine which glass, labeled A, B, C, or D, can hold the most water in five seconds. Observational skills and a sharp mind help solve it. The answer is the glass with the paper clip, indicating it can hold more water. Brain teasers like this puzzle challenge enhance critical thinking and brain function. The task is to determine which glass, labeled A, B, C, or D, can hold the most water in five seconds. Observational skills and a sharp mind help solve it. The answer is the glass with the paper clip, indicating it can hold more water. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle