Which compound in Portland cement is responsible for the early strength gain (3-7 days) and also generates the highest heat of hydration?

Why is this the answer?

C3A (Tricalcium aluminate) is responsible for the highest heat of hydration and flash set. However, C3S (Tricalcium silicate) is primarily responsible for early strength gain (within 7 days). If the question asks for the compound with the highest heat of hydration, it is C3A. If it asks for early strength, it is C3S. Given the phrasing, C3A is the most distinct answer for heat, but C3S is the standard answer for early strength. The question is ambiguous; C3A is the correct answer for 'highest heat of hydration'.

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